KR20120092508A - Light-emitting device and manufacturing method thereof, lighting device, and display device - Google Patents

Abstract

PURPOSE: A light emitting device, a manufacturing method thereof, a lighting device and a display device are provided to improve reliability by suppressing a potential drop due to the resistance of a top electrode layer. CONSTITUTION: A bottom electrode layer(103) is formed on a substrate(101). An EL layer(105) is formed on the bottom electrode layer. A top electrode layer(107) is formed on the EL layer. A partition(109) is formed on the top electrode layer. A common wire(111) is formed on the partition. A separation layer(113) is formed on the common wire.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a light emitting device, a method of manufacturing the same,

The present invention relates to a light emitting device and a manufacturing method thereof. The present invention also relates to a lighting apparatus. The present invention also relates to a display device.

Research and development of organic EL devices are actively under way. The basic structure of the organic EL element is a structure in which a layer containing an organic compound having luminescence is sandwiched between a pair of electrodes. By applying a voltage to this device, light emission from an organic compound having luminous properties can be obtained.

In addition, a display device in which an organic EL element and a thin film transistor are combined has been actively developed. The display device using the organic EL element can eliminate the backlight which is required as the liquid crystal display device, and can provide a thin, high-brightness, high-contrast display device.

Further, since the organic EL element can be formed in the form of a film, it is possible to easily form a large-area element, and the organic EL element has a high value as a surface light source applicable to illumination or the like.

For example, Patent Document 1 discloses a lighting apparatus using an organic EL element.

The organic EL element has a bottom emission type for extracting light on the side of the lower electrode layer, a top emission type for extracting light on the side of the upper electrode layer, or a double-sided emission type for extracting light from both sides of the bottom electrode layer side and the top electrode layer side .

Japanese Patent Application Laid-Open No. 2009-130132

In the case of forming an EL element, for example, a vacuum deposition method is a method for sequentially laminating a layer containing an organic compound and a top electrode layer on a lower electrode layer formed on a substrate having an insulating surface. As a method of forming an island shape using a vacuum deposition method, there is known a method of using a metal mask (also referred to as a shadow mask) in which an opening is formed in a metal plate. When the metal mask is formed between the substrate and the evaporation source in contact with the substrate, and the substrate is deposited on the substrate through the opening of the metal mask, the shape corresponding to the shape of the opening can be deposited. In addition, the closer the distance between the metal mask and the substrate is, the more the island-like layer can be formed with a clear formation according to the opening portion, in other words, a less blurring of the peripheral portion.

On the other hand, when the metal mask is used in contact with the substrate, the probability of occurrence of a problem increases. For example, the surface of the substrate may be damaged by an opening in the aperture of the metal mask. Specifically, when the metal mask comes into contact with the substrate, the metal mask rubs the surface of the substrate, thereby destroying another layer already formed on the substrate. Further, there is a case where the dust (including particles and small foreign particles called particles) attached to the metal mask is transferred from the metal mask to the substrate.

Here, in a display device having a plurality of pixel portions using an EL element, a method is known in which the light emitted from the EL element is made white and injected through a color filter. In this manner, since the light emission from the EL element is uniformly white, a metal mask for applying the EL layer to each pixel portion is not required, and an EL layer can be formed with a single metal mask, which is preferable.

However, even in the case of using the EL element of white light emission, in order to connect the common wiring formed beforehand to the substrate and the upper electrode layer of the EL element so that the EL layer is not formed at the connecting portion of the common wiring and the upper electrode layer, At least two metal masks of a metal mask and a metal mask for forming an upper electrode layer were required.

Therefore, in the in-line type film forming apparatus, it is necessary to provide a replacement chamber for exchanging the metal mask between the film formation chamber for forming the EL layer and the film formation chamber for forming the upper electrode layer, and a complicated process ), Complexity of the apparatus, and an increase in tact time.

On the other hand, when the area of the light emitting portion of the illuminating device or the display device on a large screen is widened, the potential drop caused by the resistance of the upper electrode layer and the lower electrode layer of the EL element tends to become remarkable. When the potential drop in the electrode layer becomes remarkable, there is a problem that the gradient of the luminance is visually recognized. In order to avoid such a problem, it is necessary to connect an auxiliary electrode formed of a material having a low resistivity to the electrode layer.

Particularly, a conductive material having a light transmitting property and used for a transparent electrode has a relatively high resistance, and it is highly necessary to form an auxiliary wiring. It is necessary to lay out the auxiliary wiring so as not to block the light emission from the EL element as much as possible. However, in the case of a top emission type (including both-side emission type) in which light is emitted from the upper electrode layer side, it is necessary to form an auxiliary wiring after forming the EL element, so that the EL element may be damaged. For example, when a conductive film is formed by a sputtering method and then processed using a photolithography method, damage due to light or heat in the thermal and physical damages by the sputtering method or processing by the photolithography method, And a problem related to dissolution of an EL element by an organic solvent or the like.

The present invention has been made on the basis of such a technical background. Accordingly, it is an object of the present invention to provide a light emitting device having a structure capable of reducing the metal mask used for forming the EL layer and the upper electrode layer, and a method of manufacturing the same. Another object of the present invention is to provide a light emitting device in which the potential drop due to the resistance of the upper electrode layer is suppressed and the reliability is high. Another object of the present invention is to provide a lighting device and a display device to which such a light emitting device is applied.

At least one of the above-mentioned problems of the present invention is solved.

In order to achieve the above object, the present invention has focused on a configuration of a common wiring connected to an upper electrode layer. The common wiring included in the light emitting device is formed on the substrate, and the isolation layer having the insulating property in contact with the common wiring is formed so that the upper portion of the common wiring is exposed to the substrate surface direction. The EL layer formed in the region including the isolation layer formed on the common wiring is physically divided in the isolation layer and the upper electrode layer formed in the same region on the EL layer is physically divided in the isolation layer, And may be electrically connected to the common wiring in a region overlapping with the exposed portion of the separation layer. Such a common wiring may be used as an auxiliary wiring. The light emitting device having such a common wiring may be applied to a lighting device and a display device.

The EL layer and the upper electrode layer can be formed by using the same metal mask having the opening portion on the light emitting region and the isolation layer by forming the common wiring on which the isolation layer with the above structure is formed and the contact portion with the upper electrode layer on the light emitting device. Therefore, it is not necessary to use different metal masks for the EL layer and the upper electrode layer as in the conventional art, and the problem caused by the contact between the metal mask and the substrate is suppressed as in the conventional art, and a highly reliable light emitting device, A lighting device can be used. In addition, since the metal mask is reduced, it is possible to reduce the manufacturing cost required for the metal mask and the process.

That is, a light emitting device of one embodiment of the present invention includes a lower electrode layer on a substrate, a common wiring electrically separated from the lower electrode layer, a separation layer covering at least a part of the common wiring, an EL layer on the lower electrode layer, And an upper electrode layer. The upper electrode layer is electrically connected to the common wiring in a region overlapping with the isolation layer of the common wiring, and the lower electrode layer is electrically connected to the common wiring Emitting device.

A light emitting device of one embodiment of the present invention has a separation layer on a common wiring connected to an upper electrode layer of an EL element. The separation layer is formed such that the contact surface of the bottom portion is inward of the projection surface with respect to the substrate surface. The EL layer and the upper electrode layer can be formed by using the same metal mask having an opening portion on the light emitting region and the isolation layer, or without using a metal mask by forming the separation layer having such a shape on the common wiring. The upper electrode layer and the common wiring can be electrically connected by forming the upper electrode layer end so as to be in contact with the common wiring surface overlapping with the exposed region of the separation layer.

The light emitting device of one embodiment of the present invention may use a common wiring in which the isolation layer is formed as an auxiliary wiring for assisting the conductivity of the upper electrode layer. The upper electrode layers of the different light emitting elements are electrically connected through the common wiring functioning as the auxiliary wiring by forming the upper electrode layer so as to be in contact with the common wiring in the region overlapping with the separation layer.

By using such a contact portion and the auxiliary wiring, the potential drop caused by the resistance of the upper electrode layer can be suppressed, and a highly reliable light emitting device can be obtained. Further, using the same metal mask or using no metal mask The EL layer and the upper electrode layer can be formed.

The light emitting device according to another embodiment of the present invention is characterized in that the thickness of the portion of the upper electrode layer in contact with the common wiring in the light emitting device is thinner than the thickness of the portion overlapping the lower electrode layer in the light emitting region.

Since the thickness of the contact portion of the upper electrode layer is made thin as described above, the contact surface can be made large even when the gap between the side surface of the separation layer and the common wiring is small, so that the contact resistance can be reduced. .

The light emitting device according to another embodiment of the present invention is characterized in that the side surface of the separation layer in the cross section perpendicular to the substrate of the light emitting device, the outermost point in the bottom portion of the separation layer, And has a space between adjacent lines.

By making the separating layer into a shape having a space between the side surface of the separating layer and the line between the outermost point of the bottom portion of the separating layer and the first exposing side of the side surface of the separating layer, The EL layer and the upper electrode layer can be effectively prevented from being formed on the side surface of the separation layer when the EL layer and the upper electrode layer are formed.

The upper electrode layer included in the light emitting device according to another embodiment of the present invention has light transmittance with respect to light emitted by the EL layer, and the lower electrode layer has reflectivity with respect to the light.

Particularly, in a top emission type light emitting device using a light-transmitting material for the upper electrode layer, the conductivity of the upper electrode layer can be effectively assisted by applying the common wiring functioning as the contact portion and the auxiliary wiring.

According to another aspect of the present invention, there is provided a display device having the light emitting device.

A display device which is one type of light emitting device has a pixel portion to which the common wiring of the above configuration is connected. Since the display device having such a structure can form the EL layer and the upper electrode layer using the same metal mask having an opening portion on the light emitting region and the isolation layer or without using a metal mask, .

Particularly, in a top emission type light emitting device using a material having translucency in the upper electrode layer, the common wiring can be used to assist the conductivity of the upper electrode layer effectively by applying the auxiliary wiring for assisting the conductivity of the upper electrode layer. Particularly, in the display device, since the EL element has a circuit including a transistor on the substrate side, the aperture ratio can be improved by using a top emission type.

According to another aspect of the present invention, there is provided a lighting apparatus having the light emitting device.

Since the EL layer and the upper electrode layer can be formed by using the same metal mask having openings on the light emitting region and the isolation layer or without using a metal mask by applying the light emitting device to the lighting apparatus, can do.

A method of manufacturing a light emitting device according to an embodiment of the present invention includes a step of forming a lower electrode layer on a substrate, a step of forming a common wiring, a step of forming a wiring layer And a step of forming an upper electrode layer so as to be electrically connected to the common wiring on the EL layer. The step of forming the upper electrode layer includes the steps of: forming an upper electrode layer on the lower electrode layer;

By using the above manufacturing method, the EL layer and the upper electrode layer can be formed by using the same metal mask or without using a metal mask, so that a highly reliable light emitting device can be manufactured.

In the present specification, the EL layer is a layer formed between a pair of electrodes of the light emitting element. Therefore, a light emitting layer containing an organic compound, which is a light emitting material sandwiched between electrodes, is a form of an EL layer.

In this specification and the like, a wiring electrically connected to the upper electrode layer included in the EL layer is referred to as a common wiring.

According to one aspect of the present invention, there can be provided a light emitting device having a structure capable of reducing a metal mask used for forming the EL layer and the upper electrode layer, and a method of manufacturing the same. Further, it is possible to provide a light emitting device in which a dislocation drop due to the resistance of the upper electrode layer is suppressed and which is highly reliable. Further, a lighting apparatus and a display apparatus to which such a light emitting device is applied can be provided.

1 (A) and 1 (B) are diagrams for explaining a light emitting device according to an embodiment of the present invention.
2 (A) to 2 (C) are diagrams for explaining a light emitting device according to one embodiment of the present invention.
3 (A) to 3 (D) are diagrams for explaining a manufacturing method of a light emitting device according to one embodiment of the present invention.
4 (A) to 4 (C) are diagrams for explaining a light emitting device according to an embodiment of the present invention.
5 (A) to 5 (C) are diagrams for explaining a light emitting device according to an embodiment of the present invention.
6 (A) to 6 (C) are diagrams for explaining a display device according to an embodiment of the present invention.
7 (A) and 7 (B) are diagrams for explaining a display device according to an embodiment of the present invention.
8 (A) and 8 (B) are diagrams for explaining a lighting apparatus according to an embodiment of the present invention.
9 (A) to 9 (C) are diagrams for explaining an EL element according to an embodiment of the present invention.
10 (A) and 10 (B) are diagrams for explaining a lighting apparatus according to an embodiment of the present invention.
11 (A) to 11 (C) are diagrams for explaining an electronic apparatus according to an embodiment of the present invention.
12 is a view for explaining a light emitting device according to an embodiment of the present invention.
13 is a view for explaining a display device according to an embodiment of the present invention.
14 (A) and 14 (B) are diagrams for explaining a light emitting device according to an embodiment of the present invention.
15 (A) and 15 (B) are diagrams for explaining a light emitting device according to an embodiment of the present invention.

Embodiments will be described in detail with reference to the drawings. It should be understood, however, by those skilled in the art that the present invention is not limited to the following description, and that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention. Therefore, the present invention is not construed as being limited to the description of the embodiments described below. In the following description of the invention, the same reference numerals are used for the same parts or portions having the same functions, and the repetitive description thereof will be omitted.

In each of the drawings described in the present specification, the size, the layer thickness, or the area of each structure may be exaggerated for clarity. Therefore, it is not necessarily limited to the scale.

(Embodiment 1)

In the present embodiment, examples of a light emitting device and a manufacturing method thereof, which are one embodiment of the present invention, will be described with reference to Figs. 1A to 5C.

<Configuration Example 1>

Fig. 1 (A) is a schematic top view of the light emitting device 10. Fig. 1 (B) is a schematic cross-sectional view taken along the line A-A 'in Fig. 1 (A). For clarification, the EL layer and the upper electrode layer are not shown in Fig. 1 (A).

The light emitting device 10 has a lower electrode layer 103, an EL layer 105, an upper electrode layer 107, a partition wall 109, and a common wiring 111 on a substrate 101. In addition, a separation layer 113 is formed on the common wiring 111.

Although not shown, the light emitting device 10 may have a base film that is in contact with the substrate 101, and a sealing film that covers the top electrode layer 107. By forming a base film or a sealing film, deterioration of the EL layer can be suppressed and reliability of the light emitting device 10 can be enhanced.

The light emitting device 10 can emit light by applying a voltage to the light emitting element including the base electrode layer 103 and the upper electrode layer 107 and the EL layer 105 sandwiched therebetween.

The barrier ribs 109 are formed at the ends of the base electrode layer 103 and the common wiring 111. The barrier ribs 109 formed at these end portions are formed such that the EL layer 105 and the upper electrode layer 107 are not disconnected due to these step differences. Therefore, it is preferable that the partition wall 109 has a net taper shape so that the film formed on the upper surface thereof does not break. The forward tapered shape refers to a structure of a layer in which a layer increases its thickness gently at its upper end portion in cross section.

The common wiring 111 is formed so as to surround the periphery of the lower electrode layer 103 and includes at least a conductive material having a lower resistance than the upper electrode layer 107. [ On the common wiring 111, a separation layer 113 formed in contact with the common wiring 111 is formed.

The isolation layer 113 has an insulating property, and the upper portion thereof has a shape protruding in a direction parallel to the substrate surface. In other words, when the separation layer 113 is projected on the substrate surface, the area of the region contacting the common wiring 111 is smaller than the largest projection area, and the shape is formed on the inner side of the projection plane.

The EL layer 105 and the upper electrode layer 107 are formed by forming the separation layer 113 having the above-described shape and by a method to be described later, so that the EL layer 105 is separated The upper electrode layer 107 is in contact with the upper surface of the common wiring 111 in a region overlapping with the exposed portion of the separation layer 113 and is electrically connected thereto .

Therefore, the upper electrode layer 107 is electrically connected to the common wiring 111 surrounding the lower electrode layer 103, so that the common electrode 111 can be applied with the common potential through the upper electrode layer 107 .

Here, as the metal mask used for forming the EL layer 105 and the upper electrode layer 107, a metal mask having an opening portion on the lower electrode layer 103 and the common wiring 111 can be commonly used. The upper electrode layer 107 to be formed later can be electrically connected to the common wiring 111 even if the EL layer is formed on the common wiring 111 by forming the separation layer 113 on the common wiring 111. [

Further, the EL layer 105 and the upper electrode layer 107 may be formed without using a metal mask. The common wiring 111 and the upper electrode layer 107 are electrically connected even when the EL layer 105 and the upper electrode layer 107 are formed over the entire region covering the light emitting device 10 without using a metal mask. The formation of the EL layer 105 and the upper electrode layer 107 without using a metal mask is preferable because the problem caused by the contact between the metal mask and the substrate 101 is eliminated.

Here, FIG. 12 is a schematic cross-sectional view showing an enlarged area in which the common wiring 111 and the upper electrode layer 107 are connected.

12 indicate the contact portions of the common wiring 111 and the upper electrode layer 107. As shown in Fig. The common wiring 111 and the upper electrode layer 107 are in contact with each other at a part of the surface of the common wiring 111 overlapping with the exposed portion of the separation layer 113 and are electrically connected to each other. Here, the thickness of the portion of the upper electrode layer 107 which is in contact with the common wiring 111 is set to be larger than the thickness of the light emitting portion (the region where the lower electrode layer 103, the EL layer 105 and the upper electrode layer 107 are stacked) Is formed thinner than the thickness of the upper electrode layer (107). The thickness of the contact portion of the upper electrode layer 107 may be a so-called net taper shape that becomes thinner toward the isolation layer 113. In this manner, since the thickness of the contact portion is made thin, the contact surface can be made large even when the gap between the side surface of the separation layer 113 and the common wiring 111 is small, so that the contact resistance can be reduced.

In order to separate the EL layer 105, the shape of the separation layer 113 may be a shape that suppresses the formation of a film on the side surface of the separation layer when the EL layer 105 is formed. For example, The angle between the line connecting the point where the first layer of the layer 113 and the side of the separation layer 113 are in contact with the common wiring 111 and the substrate surface may be as small as possible. Further, it may be constricted to provide a space between the line and the side surface of the separation layer 113.

In the present embodiment, the separation layer 113 is formed in contact with the common wiring 111. However, if at least a portion of the region overlapping with the exposed portion of the separation layer 113 overlaps the surface of the common wiring 111, The isolation layer 113 may not be formed on the common wiring 111.

The common wiring 111 is drawn out to the outside of the light emitting device 10 and the potential applied to the upper electrode layer 107 is supplied. Also. The lower electrode layer 103 is likewise drawn out to the outside of the light emitting device 10 and the potential applied to the lower electrode layer 103 is supplied. In the present embodiment, the common wiring 111 is formed of a material different from that of the lower electrode layer 103 and a different process. However, the same material having a resistance lower than that of the upper electrode layer 107 may be used, The electrode layer 103 may be formed by the same process as the process for forming the electrode layer 103. [ The lower electrode layer 103 may be connected to a lead wiring formed of the same material as the common wiring 111. [

By applying the common wiring 111 and the separation layer 113 as described above to the light emitting device 10, a metal covering the connection portion of the common wiring 111 and the upper electrode layer 107 when the EL layer 105 is formed It is not necessary to use a mask and can be formed by using a metal mask such as the upper electrode layer 107. [ Therefore, since the number of metal masks used in fabricating the light emitting device 10 can be reduced, problems caused by contact between the metal mask and the substrate are reduced, and a highly reliable light emitting device can be obtained.

&Lt; Configuration Example 2 &

The common wiring 111 formed with the separation layer 113 as described above can also be used as an auxiliary wiring for assisting the conductivity of the upper electrode layer 107. [ Hereinafter, the light emitting device 100 in which the common wiring 111 having the separation layer 113 is applied to the auxiliary wiring of the upper electrode layer 107 will be described.

Fig. 2 (A) is a schematic top view of the light emitting device 100. Fig. 2 (B) is a schematic cross-sectional view taken along a line B-B 'in Fig. 2 (A), and Fig. 2 (C) is a schematic cross-sectional view along a line C-C' shown in Fig. For clarification, the EL layer and the upper electrode layer are not shown in Fig. 2 (A).

The light emitting device 100 has a lower electrode layer 103, an EL layer 105, an upper electrode layer 107, a partition wall 109, and a common wiring 111 on a substrate 101. A separation layer 113 and a separation layer 115 surrounding the outer periphery of the light emitting device 100 are provided on the common wiring 111.

Although not shown, the light emitting device 100 may have a base film that is in contact with the substrate 101, and a sealing film that covers the top electrode layer 107. By forming a base film or a sealing film, deterioration of the EL layer can be suppressed, and reliability of the light emitting device 100 can be enhanced.

The light emitting device 100 can emit light by applying a voltage to the light emitting element including the base electrode layer 103 and the upper electrode layer 107 and the EL layer 105 sandwiched therebetween.

The barrier ribs 109 are formed at the ends of the base electrode layer 103 and the common wiring 111. The barrier ribs 109 formed at these end portions are formed such that the EL layer 105 and the upper electrode layer 107 are not disconnected due to these step differences. Therefore, it is preferable that the partition wall 109 has a net taper shape so that the film formed on the upper surface thereof does not break. The tapered shape refers to a constitution of a layer in which a layer increases its thickness gently at its upper end in a cross-section.

The common wiring 111 includes a conductive material having a resistance sufficiently lower than at least the upper electrode layer 107 and the common wiring 111 has a separation layer 113 formed in contact with the common wiring 111.

The isolation layer 113 has an insulating property, and the upper portion has a shape protruding in a direction parallel to the substrate surface. In other words, when the separation layer 113 is projected on the substrate surface, the area of the region contacting the common wiring 111 is smaller than the largest projection area, and the shape is formed on the inner side of the projection plane.

The EL layer 105 and the upper electrode layer 107 are formed by forming the separating layer 113 having such a shape and by a method to be described later so that the EL layer 105 is separated The upper electrode layer 107 is in contact with the upper surface of the common wiring 111 in a region overlapping with the exposed portion of the separation layer 113 and is electrically connected thereto .

Therefore, the upper electrode layer 107 is not electrically separated, and electrical connection is guaranteed over the entire light emitting region of the light emitting device 100 through the common wiring 111. [ The potential drop caused by the resistance of the upper electrode layer 107 is suppressed by the common wiring 111 electrically connected to the upper electrode layer 107.

In order to separate the EL layer 105, the shape of the separation layer 113 may be a shape that suppresses the formation of a film on the side surface of the separation layer when the EL layer 105 is formed. For example, The angle between the line connecting the point where the first layer of the layer 113 and the side of the separation layer 113 are in contact with the common wiring 111 and the substrate surface may be as small as possible. Further, it may be constricted to provide a space between the line and the side surface of the separation layer 113.

Further, the common wiring 111 is drawn out to the outside of the light emitting device 100, and the potential applied to the upper electrode layer 107 is supplied. The lower electrode layer 103 is likewise drawn out to the outside of the light emitting device 100 and the potential applied to the lower electrode layer 103 is supplied.

Further, the light emitting device 100 has a separation layer 115 formed on the partition wall 109 so as to surround it. The isolation layer 115 has a function of physically and electrically dividing the EL layer 105 and the upper electrode layer 107. [ Therefore, even when the EL layer 105 and the upper electrode layer 107 are formed without using a metal mask, for example, by surrounding the light emitting device 100 with the separation layer 115, the light emitting device 100 The upper electrode layer 107 included in the upper electrode layer 107 can be electrically isolated from the outside of the separation layer 115.

Fig. 2 (C) is a schematic cross-sectional view taken along a line C-C 'shown in Fig. 2 (A). A separation layer 115 formed to surround the light emitting device 100 is formed on the partition wall 109 and divides the EL layer 105 and the upper electrode layer 107. By forming the separation layer 115, when the light emitting devices 100 are disposed adjacent to each other, they can be electrically separated.

The separation layer 115 is formed of the same material and the same process as the separation layer 113, and the upper portion thereof has a shape protruding in a direction parallel to the substrate surface direction. Thus, the isolation layer 115 divides the EL layer 105 and the upper electrode layer 107 together when they are formed. The end portions of the EL layer 105 and the upper electrode layer 107, which are separated with the separation layer 115 as a boundary, come in contact with the partition wall 109 together. Therefore, the upper electrode layer 107 is electrically separated by interposing the separation layer 115 therebetween.

In the case where the light emitting device 100 is used singly or when it is not necessary to electrically isolate adjacent light emitting devices 100, the separation layer 115 may not be formed.

Although the common wiring 111 and the lower electrode layer 103 are arranged on the substrate 101 using different materials and different processes, the common wiring 111 and the lower electrode layer 103 may be formed by using the same material and the same process You may. In such a case, a lead wiring is formed on the substrate 101 with a low resistance material, a planarization film having an opening portion is formed on the lead wiring, and the wiring is connected to the common wiring 111 or the lower electrode layer 103 . In the case of the top emission type light emitting device, the light emitting area with respect to the area of the substrate 101 can be increased by forming the lead wirings on the lower side of the light emitting device 100.

The metal layer covering the connection portion of the common wiring 111 and the upper electrode layer 107 when forming the EL layer 105 can be formed by applying the common wiring 111 and the separation layer 113 as described above to the light emitting device 100. [ It is not necessary to use a mask and can be formed by using a metal mask such as the upper electrode layer 107. [ Therefore, the number of metal masks used when fabricating the light emitting device 100 is reduced, and the problems caused by the contact between the metal mask and the substrate are reduced, and a highly reliable light emitting device can be obtained.

Further, by the common wiring 111 made of a low resistance material, the influence of the potential drop caused by the resistance of the upper electrode layer 107 can be suppressed to a minimum, and a highly reliable light emitting device can be obtained. In particular, the upper electrode layer 107 has a large effect in the case of a top emission type light emitting device using a transparent conductive film having a high resistance.

Even when a plurality of light emitting devices 100 are disposed adjacent to each other, the separation layer 115 is formed so as to surround the light emitting device 100 as described above, so that the EL layer 105 and / When the upper electrode layer 107 is formed, they can be electrically separated. Further, since the EL layer and the upper electrode layer can be formed without using a metal mask, the problem caused by the contact between the metal mask and the substrate is eliminated, and an EL light emitting device with high reliability can be obtained.

<Material>

An example of a material usable for each layer is described below.

[Board]

In the case where the light emitting device 100 is a bottom emission type or a both-side emission type, as the material of the substrate 101, a material having translucency such as glass, quartz, organic resin, or the like can be used. In the case of the top emission type, it is not necessary to have light transmittance. Materials such as metal, semiconductor, ceramics, and colored organic resin may be used in addition to the above materials. When a conductive substrate is used, it is preferable that the surface of the substrate is made insulating or insulating by forming an insulating film on the surface.

When an organic resin is used as the substrate 101, examples of the organic resin include a polyester resin such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN), an acrylic resin, a polyacrylonitrile resin, (PC), polyether sulfone resin (PES), polyamide resin, cycloolefin resin, polystyrene resin, polyamideimide resin, polyvinyl chloride resin and the like can be used . It is also possible to use a substrate in which a glass fiber is impregnated with a resin or a substrate in which an inorganic filler is mixed with an organic resin.

In particular, in the case of the top emission type light emitting device 100, a substrate having a high thermal conductivity such as a metal substrate is preferably used as the substrate. In the case of a large illuminating device using an EL element, heat generation from the EL element may be a problem. Therefore, when such a substrate having high thermal conductivity is used, heat generation is enhanced. For example, when aluminum oxide, duralumin, etc. are used in addition to a stainless steel substrate, lightness and heat dissipation can be improved. In addition, it is preferable to use a lamination of aluminum and aluminum oxide, a lamination of duralumin and aluminum oxide, a lamination of duralumin and magnesium oxide, etc., so that the surface of the substrate can be made insulating.

[Sealing membrane? Lower membrane]

In the case of a light-emitting type or double-side light-emitting type light-emitting device, the sealing film-base film can be formed using a material having translucency and barrier properties. In a top emission type light emitting device, it is not necessarily required to have light transmittance.

As the sealing film-underlying film, for example, an inorganic insulating film can be formed by a sputtering method. For example, a silicon nitride film, an aluminum oxide film, a silicon oxide film, or the like may be formed. Further, a sealing film formed on the side opposite to the light emitting direction, or a film obtained by laminating the metal film and the inorganic insulating film as the underlying film may be used.

It is preferable that the sealing film has, for example, a gas barrier property with a water permeability of about 10 ^-6 g / m ² · day or less. As the constitution of the sealing film, for example, a laminate in which at least one layer containing an inorganic substance is sandwiched between layers containing an organic substance can be used. Examples of the layer containing an organic material include an adhesive layer such as an epoxy-based material, and examples of the layer containing an inorganic material include a film having barrier properties such as silicon oxide and silicon nitride.

When an organic resin is used as the substrate, a glass layer having a thickness of 25 占 퐉 or more and 100 占 퐉 or less may be used as a base film. The thickness of the glass layer is typically 45 占 퐉 or more and 80 占 퐉 or less. By combining the organic resin substrate and the glass layer, it is possible to suppress moisture or impurities from entering the organic compound or metal material contained in the light emitting element from the outside of the light emitting device, and to realize light weight of the light emitting device.

[Separation layer]

The separating layer may be formed using an inorganic insulating material or an organic insulating material. For example, a resin material having a photosensitivity of a negative or positive type, a resin material having a non-photosensitivity, or the like can be used.

[Light Emitting Element]

As the material having light transmittance that can be used for the light emitting side electrode layer, indium oxide, indium oxide tin oxide, zinc oxide indium oxide, zinc oxide, zinc oxide with gallium added, graphene and the like can be used.

As the electrode layer, a metal material such as gold, silver, platinum, magnesium, nickel, tungsten, chromium, molybdenum, iron, cobalt, copper, palladium or titanium or an alloy thereof may be used. Alternatively, a nitride of these metal materials (for example, titanium nitride) or the like may be used. When a metal material (or a nitride thereof) is used, it may be made thin enough to have translucency.

In addition, a laminated film of the above material can be used as an electrode layer. For example, it is preferable to use an alloy of silver and magnesium, a lamination film of indium oxide and tin oxide, or the like because conductivity can be increased.

The film thickness of the electrode layer on the light emitting side is, for example, 50 nm or more and 300 nm or less, preferably 80 nm or more and 130 nm or less, and more preferably 100 nm or more and 110 nm or less.

The EL layer has a layer containing an organic compound having at least luminous properties. In addition, a layer containing a substance having a high electron-transporting property, a layer containing a substance having a high hole-transporting property, a layer containing a substance having a high electron-injecting property, a layer containing a substance having a high hole- (A material having a high electron transporting property and a high hole transporting property), and the like can be appropriately combined to form a laminated structure.

In an aspect of the present invention, a light emitting element (tandem light emitting element) having a plurality of EL layers formed between an upper electrode layer and a lower electrode layer can be applied. Preferably two to four layers (particularly three layers). An example of the configuration of the EL layer is described in detail in Embodiment 4. [

The electrode layer formed on the side opposite to the light emitting side is formed using a material having reflectivity. As the material having reflectivity, a metal material such as aluminum, gold, platinum, silver, nickel, tungsten, chromium, molybdenum, iron, cobalt, copper or palladium can be used. In addition, an alloy including aluminum (aluminum alloy) such as an alloy of aluminum and titanium, an alloy of aluminum and nickel, an alloy of aluminum and neodymium, an alloy of silver and copper, an alloy including silver and magnesium, May be used. Silver and copper alloys are preferable because they have high heat resistance. Further, by laminating a metal film or a metal oxide film in contact with the aluminum alloy film, oxidation of the aluminum alloy film can be suppressed. Examples of the material of the metal film and the metal oxide film include titanium and titanium oxide.

[Common wiring and wiring]

As a material of the common wiring and wiring, copper (Cu), titanium (Ti), tantalum (Ta), tungsten (W), molybdenum (Mo), chromium (Cr), neodymium (Nd), scandium Ni), or an alloying material containing any of them as a main component, in a single layer or in a laminate. Aluminum may also be used as the material of the wiring, but in this case, it may be corroded if it is formed directly in contact with indium oxide, tin oxide or the like. Therefore, aluminum may be used for the layer having the wiring as a laminated structure and not in contact with the indium oxide tin oxide or the like. Further, copper is preferably used because it has a low resistance. The film thickness of the wiring is preferably 100 nm or more and 35 占 퐉 or less.

[septum]

As the material of the barrier rib, for example, an organic resin such as a polyimide resin, an acrylic resin, a polyamide resin, an epoxy resin, or an inorganic insulating material can be used.

The angle of the side surface of the other layer contacting the end of the net tapered shape with the underlying layer is, for example, not less than 10 degrees and not more than 85 degrees, preferably not less than 60 degrees and not more than 80 degrees.

In particular, it is preferable to form the opening by using a photosensitive resin material, and form the side surface of the opening to be a slope having a continuous curvature. Specifically, it is preferable that the curved surface radius of the curved line drawn by the cross section of the insulating film is about 0.2 占 퐉 to 2 占 퐉.

The method of forming the barrier ribs is not particularly limited, and a printing method (screen printing, offset printing, etc.) of a sputtering method, a vapor deposition method, a coating method, a droplet discharge method (inkjet method or the like)

The film thickness of the barrier rib may be, for example, 20 nm or more and 20 占 퐉 or less. And preferably 50 nm or more and 3 m or less.

[Planarizing film]

The planarizing film may be formed using an inorganic insulating material or an organic insulating material. When an organic insulating material having heat resistance such as an acrylic resin, a polyimide resin, a benzocyclobutene resin, a polyamide resin, or an epoxy resin is used, it is suitable as a planarizing insulating film. In addition to the organic insulating material, a low dielectric constant material (low-k material), siloxane-based resin, PSG (phosphorous glass), BPSG (boron glass) and the like can be used. A planarizing film may be formed by laminating a plurality of insulating films formed of these materials.

The method for forming the planarizing film is not particularly limited, and a sputtering method, a spin coating method, a dipping method, a printing method, an inkjet method, or the like can be used depending on the material.

<Production method example>

Next, an example of a method of manufacturing the light emitting device 100 on a substrate will be described with reference to Figs. 3A to 3D.

In the embodiment, a light emitting device of a top emission type is described as an example of the light emitting device 100. However, in the case of a bottom emission type, when a light transmitting material is used for the lower electrode layer and a material having reflectivity is used for the upper electrode layer good. In the case of a double-sided injection type, a light-transmissive material may be used for both the upper surface electrode layer and the lower electrode layer.

In the case of forming the light emitting device 10, the following manufacturing methods can be applied by making the formation patterns of the respective layers different in the method of manufacturing the light emitting device 100, which will be described below.

First, a lower electrode layer 103 and a common wiring 111 are formed on a substrate 101.

The lower electrode layer 103 and the common wiring 111 are formed by first removing an unnecessary portion by using a known photolithography method using a deposition method such as a sputtering method.

Here, either the lower electrode layer 103 or the common wiring 111 may be formed first. In this case, when the conductive film formed later is etched, it is important to select an etching method that does not etch the previously formed layer. When the lower electrode layer 103 and the common wiring 111 are formed of the same material, they can be formed at the same time.

Further, a base film may be formed before the lower electrode layer 103 is formed. An insulating film serving as a barrier film serving as a base film can be used and can be formed by a film forming method such as a CVD method or a sputtering method.

Further, a lead wiring is formed on the substrate 101 using a low-resistance material, a planarization film having an opening is formed on the lead wiring, and the common wiring 111 and the lower electrode layer 103 formed on the planarization film are connected to the lead wiring May be connected. As the planarizing film, the above-described insulating material may be used.

And then the barrier ribs 109 are formed. The barrier ribs 109 can be formed using the materials and manufacturing methods exemplified above. For example, it is formed by applying a photosensitive resin material by a spin coating method, and performing exposure and development processing.

A schematic cross-sectional view at this stage corresponds to Fig. 3 (A).

Next, a separation layer 113 and a separation layer 115 are formed. Here, a method of forming by using an organic resin having negative photosensitivity will be described.

First, an organic resin film 117 containing an organic resin having a negative photosensitive property is formed. The organic resin film 117 can be formed by a coating method such as a spin coating method, a droplet discharging method (ink jet method), a printing method (screen printing, offset printing, etc.).

Subsequently, exposure light 121 is irradiated to the organic resin film 117 in the region where the separation layer 113 and the separation layer 115 are formed later via the mask 119 (see FIG. 3 (B)). Here, the exposure light 121 is adjusted so that the exposure intensity decreases as the thickness of the organic resin film 117 becomes closer to the substrate 101. Since the organic resin having negative photosensitivity has a property that the photosensitized area has a lower solubility at the time of development processing, light is irradiated so that the exposure intensity becomes larger as the film surface becomes larger and gets closer to the substrate 101 The shape of the separation layer 113 and the separation layer 115 that are formed through development processing becomes smaller as the projection area becomes closer to the substrate 101. [

When the exposure is performed, the focal point of the exposure may be artificially shifted so that the exposure intensity in a region close to the substrate 101 may be reduced.

Subsequently, the development processing is performed to remove the organic resin film 117 in the region to which the exposure light 121 is not irradiated, whereby the separation layer 113 and the separation layer 115 are formed (see Fig. 3 (C)). The separation layer 113 and the separation layer 115 may be cured by performing a heat treatment.

Here, when an inorganic insulating material is used for the separation layer 113 and the separation layer 115, an inorganic insulating film is formed using a deposition method such as a sputtering method or a CVD method, and then a photoresist using a known resist mask An unnecessary portion of the inorganic insulating film may be formed by etching. Here, the etching time is extended so that the lower side surface is etched after the inorganic insulating film is etched when etching, whereby the reverse tapered separation layer 113 and the separation layer 115 can be obtained.

It is important that the separation layer 113 and the separation layer 115 have a shape that physically separates the upper electrode layer 107 when the upper electrode layer 107 is formed. For example, when the upper electrode layer 107 is formed, it is formed on the side surfaces of the separation layer 113 and the separation layer 115, and the problem of not being physically divided can be suppressed have.

The isolation layer 115 may be formed as a single layer, as described above, or may be formed of a multilayer of two or more layers, or may be formed by combining an insulating organic material and an inorganic material.

Next, the EL layer 105 and the upper electrode layer 107 are formed without using a metal mask (see Fig. 3 (D)).

The EL layer 105 can be formed using a vapor deposition method. The EL layer 105 formed here is physically divided by the separation layer 113 and the separation layer 115. [ In the vicinity of the isolation layer 113, the end of the EL layer 105 is formed in contact with the common wiring 111 beyond the partition wall 109. In addition, near the isolation layer 115, the end of the EL layer 105 is formed in contact with the barrier rib 109. [

The upper electrode layer 107 can be formed by a vapor deposition method or a sputtering method. It is important that the formation of the upper electrode layer 107 is carried out at least so as to come into contact with the region of the surface of the common wiring 111 which overlaps the protruding portion of the separation layer 113. As a method of forming the upper electrode layer 107 so as to be in contact with a region of the surface of the common wiring 111 which overlaps with the projecting portion of the separation layer 113, , And the like.

The upper electrode layer 107 thus formed is electrically connected to the common wiring 111 because it contacts the common wiring 111 beyond the end of the EL layer 105. [ Therefore, it is possible to suppress the potential drop caused by the resistance of the upper electrode layer 107 when the light emitting device 100 emits light.

Thereafter, a sealing film covering the upper electrode layer 107 is formed. By forming the sealing film, invasion of impurities such as water from the outside can be suppressed, so that the light emitting device 100 with high reliability can be obtained.

The light emitting device 100 can be manufactured by the above-described manufacturing process. By using such a manufacturing method, it is possible to manufacture the light emitting device 100 without using a metal mask, so that the problem caused by the contact between the metal mask and the substrate is eliminated and an EL light emitting device with high reliability can be obtained.

<Modifications>

The separating layer 113 and the separating layer 115 exemplified above may take various forms as long as the EL layer 105 and the upper electrode layer 107 are physically separated from each other. An example of a shape that can be used as the separation layer 113 and the separation layer 115 will be described with reference to Figs. 4 (A) to 4 (C).

The separation layer 131 shown in Fig. 4 (A) has a constricted shape on its side surface. In other words, it has a shape having a space between the outermost point of the bottom portion of the separation layer 131 and the side of the separation layer 131, which is the line connecting the first projection point of the side surface 131 of the separation layer. When the EL layer 105 and the upper electrode layer 107 are formed with a large portion formed on the side surface of the layer, the EL layer 105 and the upper electrode layer 107 are effectively divided .

In addition, the separation layer 133 shown in Fig. 4 (B) has such a shape that the angle between the side surface and the ground plane at the lower part thereof becomes small. With such a shape, a portion formed on the side surface of the EL layer 105 and the upper electrode layer 107 in the lower portion is suppressed, and they can be effectively divided.

Here, the separation layer may be formed by combining two or more insulating materials.

The separating layer 135 shown in Fig. 4 (C) has corner portions 135a including an organic insulating material and a pedestal portion 135b including an inorganic insulating material. Each corner 135a is formed such that its projection plane is smaller than the neck 135b and is disposed on the inner side, and may have a constricted shape as shown in Fig. 4 (C). By forming the bottom surface of the green portion 135b in such a manner that the surface facing the substrate 101 is exposed, the portion formed on the side surface of the EL layer 105 and the top electrode layer 107 It is possible to separate them effectively. As a manufacturing method of the separation layer 135, for example, a laminated film of an organic insulating film and an inorganic insulating film is formed, and the inorganic insulating film is first etched by photolithography to form the neck portion 135b. Thereafter, the organic insulating film is etched by using the neck portion 135b as a hard mask, and then the side portions are further etched so as to be retreated to form the corner portions 135a.

The shape of the separable layer that can be used for the light emitting device 100 is not limited to the above, but may be any shape as long as it can physically separate the EL layer and the upper electrode layer, And has a shape protruding in a direction parallel to the substrate surface. In other words, when the separation layer is projected onto the surface of the substrate, the area of the region contacting the lower layer is smaller than the projection area, and the shape is formed on the inner side. Further, if the side surface of the separation layer and the constricted shape having a space on the inner side than the line connecting the outermost point of the bottom portion of the separation layer and the outermost point of the side surface of the separation layer are restrained from spreading the EL layer and the upper electrode layer .

The separation layer may have a laminated structure of two or more layers. The material constituting the separation layer may be an insulating material, and an inorganic insulating film, a non-photosensitive organic insulating film, or a photosensitive organic insulating film (including a negative type or a positive type) may be used. When a laminated structure is used, it can be formed by appropriately selecting from the above materials.

Here, the light emitting device 100 may have a structure in which an auxiliary wiring is formed in the lower electrode layer 103 as well. Particularly, in the case of a light emitting device of a bottom emission type (including a double-sided emission type), a light transmitting conductive material having a relatively high resistance is used as the bottom electrode layer 103, and therefore it is effective to form the auxiliary wiring. Also, in the top emission type light emitting device, if the light emitting area is increased, the resistance of the lower electrode layer 103 may not be negligible, and the auxiliary wiring may be required. Hereinafter, an example of the auxiliary wiring formed in the lower electrode layer 103 will be described with reference to FIGS. 5 (A) to 5 (C).

Fig. 5A shows a structure in which auxiliary wiring 123, which is in contact with the lower side of the lower electrode layer 103, is formed. With such a configuration, in the case of the bottom emission type, since the area for shielding the light is only the auxiliary wiring 123, the aperture ratio can be increased. In addition, in the case of the top emission type, since the region just above the auxiliary wiring 123 can be used as the light emitting region, the aperture ratio is not lowered, which is preferable.

The barrier ribs 125 may be provided so as to cover the ends of the auxiliary wiring 123 when the EL layer 105 and the upper electrode layer 107 are likely to be disconnected due to the step at the end of the auxiliary wiring 123 . 5B shows a structure in which the barrier ribs 125 covering the end portions of the auxiliary wiring 123 are formed in contact with the lower electrode layer 103. Since the lamination of the EL layer 105 and the upper electrode layer 107 is formed in contact with the barrier rib 125 at the end portion of the auxiliary wiring 123, disconnection is suppressed. 5C, the barrier ribs 125 may be formed between the auxiliary wirings 123 and the lower electrode layer 103. In addition, as shown in Fig. Particularly, in the case of the top emission type, it is preferable to use such a structure so that the partition wall 125 can also be a light emitting region.

In the present embodiment, only the constitution in which the auxiliary wiring 123 is formed on the lower side of the lower electrode layer 103 is exemplified, but it may be formed on the upper side. In this case, the barrier ribs 125 may be appropriately formed in order to alleviate the influence of the step caused by the ends of the auxiliary wiring 123.

In the case where the common wiring 111 connected to the lower electrode layer 103 and the upper electrode layer 107 is formed by different materials and different processes, It is preferable to form the wiring 123. The common wiring 111 and the auxiliary wiring 123 are formed on the upper or lower layer of the lower electrode layer 103 by appropriately changing the order of forming the lower electrode layer 103 and the common wiring 111 and the auxiliary wiring 123 can do.

Here, in the light emitting device of one embodiment of the present invention, the light emitting devices can be connected in series by applying the separation layer and the common wiring. For example, in a lighting apparatus having a light emitting device, a converter is used to convert from a home power supply voltage to a voltage for driving the lighting device, but when the driving voltage of the light emitting device is low, conversion efficiency by the converter is lowered . Thus, by connecting the light-emitting devices in series, the driving voltage of the lighting device can be increased, and waste of electric power at the time of conversion by the converter can be reduced.

Hereinafter, a configuration in which the light emitting device is connected in series using the separation layer and the common wiring as described above will be described with reference to Figs. 14 (A) and 14 (B).

14A is a schematic top view of a light emitting device according to an embodiment of the present invention and a series connection portion thereof. Fig. 14B is a cross-sectional view taken along a section line H-H ' Fig. 14 (A), the EL layer 105 and the upper electrode layer 107 are not shown for the sake of clarity.

The connection portion of the light emitting device 150a and the light emitting device 150b is provided with an insulating layer 153 having an opening portion on the common wiring 111 and a light emitting device 150b connecting the common wiring 111 in the opening portion. An electrode layer 103 and partition walls 109 overlapping the ends of the common wiring 111 on the lower electrode layer 103. And is connected in series by a separation layer 113 formed on the common wiring 111

Here, the side surface of the separation layer 113 on the side of the light emitting device 150b is in contact with the partition wall 109 on the lower electrode layer 103, while the side surface facing the partition wall 109 is exposed. The upper electrode layer 107 of the light emitting device 150a is electrically connected to the lower electrode layer 103 of the light emitting device 150b in a region overlapping with the exposed portion of the separation layer 113. [ The upper electrode layers 107 of the light emitting device 150a and the light emitting device 150b are electrically separated by the separation layer 113. [

Next, an example of connecting a plurality of light emitting devices in series using the above connection method is shown. Hereinafter, a configuration in which four light emitting devices are connected in series will be described with reference to Figs. 15 (A) and 15 (B).

Figs. 15A and 15B are schematic diagrams in the case where four light emitting devices (light emitting devices 160a to light emitting devices 160d) are connected in series, respectively.

The four light emitting devices (light emitting device 160a to light emitting device 160d) shown in Fig. 15 (A) are connected in series through a connecting portion 161. [ Further, the periphery thereof is covered with the separating layer 115. The EL layer and the upper electrode layer can be electrically separated at the periphery thereof by the separation layer 115. [

The configuration of Fig. 15 (B) is a configuration in which each light emitting device has a band shape. With this arrangement, the current path through the light emitting device can be shortened, so that the luminance unevenness due to the voltage drop due to the resistance of the wiring and the electrodes can be suppressed.

The connecting portion between the light emitting devices exemplified above can be applied to the connecting portion 161. [

As described above, by forming the common wiring and the isolation layer having the structures exemplified above between two adjacent light-emitting devices, at least a metal mask having an opening in a region including a separation layer is used, or a metal mask is not used Light emitting devices can be connected in series when the EL layer and the upper electrode layer are formed.

Here, in the case where a plurality of light emitting devices are connected in series by the above-described connecting portion, the light emitting device may have a decrease in light emission luminance due to the potential drop due to the resistance of the upper electrode layer as the distance from the connecting portion increases . Even in such a case, the light emission luminance from the light emitting device can be made uniform by forming the auxiliary wiring with the above-described separation layer in each light emitting device.

By applying a plurality of light-emitting devices connected in series in this manner to the lighting device, it is possible to reduce power conversion waste of the converter and to provide a lighting device with low power consumption.

The present embodiment can be carried out in appropriate combination with other embodiments described in this specification.

(Embodiment 2)

In this embodiment, an example in which the common wiring and the isolation layer exemplified in the above-described embodiments are applied to a display device having a plurality of pixel portions will be described with reference to Figs. 6A to 7C.

6 (A) is a schematic top view of a display device 20 which is an embodiment of the present invention.

The display device 20 has a display region 21 having a plurality of pixel portions 201 periodically arranged and a common wiring 211 surrounding the display region 21. [ The common wiring 211 is electrically connected to the upper electrode layer formed in the pixel portion 201 in the display region 21 and inputs the common potential to the upper electrode layer.

FIG. 6B is a top view schematic view of an area surrounded by the one-dot chain line in FIG. 6A and including the pixel portion 201 and the common wiring 211 enlarged.

And has a common wiring 211 adjacent to the display region 21 including the plurality of pixel portions 201. [ 6B shows only one region including the common wiring 211 of the display device 20 and the lower electrode layer 203 and the lower electrode layer 203 are dashed on the pixel portion 201, And only a contact region shown by a circular dashed line is shown.

6 (C) is a schematic cross-sectional view taken along the line D-D 'and E-E' shown in Fig. 6 (B). Sectional view of a region including the transistor 220 formed in the contact region and the pixel portion 201, a cross-section E-E 'of the pixel portion 201 disposed on the outermost side, Sectional view of a region including the common wiring 211 adjacent to the common wiring 211. FIG.

The pixel portion 201 has at least one transistor (transistor 220), a lower electrode layer 203 connected to the transistor 220 through a contact region, and an EL layer 205 and an upper electrode layer 207 . The lower electrode layer 203 and the end of the common wiring 211 to be described later and the partition 209 covering the contact region are also provided.

Further, it is preferable to form a sealing film covering at least the pixel portion 201. [

The transistor 220 is formed on the substrate 101 with a base film 221 interposed therebetween and has a semiconductor layer 223 and a gate electrode 225. A first electrode 227 is formed on one of a source and a drain formed in the semiconductor layer 223 through a contact hole formed in the first insulating layer 231 covering the transistor 220, Respectively.

The first electrode 227 and the second electrode 227 are connected to each other through a contact portion formed in the second insulating layer 233 covering the transistor 220, the first electrode 227, the second electrode 229, And the electrode layer 203 is connected. Therefore, the transistor 220 and the lower electrode layer 203 are connected.

The voltage or current supplied to the lower electrode layer 203 is controlled by the switching operation of the transistor 220 and the light emission from the pixel portion 201 is controlled.

The common wiring 211 is formed so as to surround the plurality of pixel portions 201, and the end portions thereof are covered by the barrier ribs 209. On the common wiring 211, a separation layer 213 is formed. And also contacts the upper electrode layer 207 in a part of the region not covered with the partition wall 209 and the separation layer 213 of the common wiring 211. Therefore, the upper electrode layer 207 commonly formed in the plurality of pixel portions 201 is electrically connected to the common wiring 211. [

The separation layer 213 can be applied to various types of separation layers illustrated in the above embodiments.

The pixel portion 201 may have at least one transistor and may have circuit elements such as a plurality of transistors or capacitors by a method of driving the display device 20, a circuit configuration or the like.

The pixel portion 201 may be any of a top emission type, a bottom emission type, and a double-sided emission type, but it is preferable that the pixel portion 201 is a top emission type because the aperture ratio of the emission region can be increased. (The semiconductor layer 223, the gate electrode 225, the first electrode 227, the second electrode 229, and the like) constituting the transistor 220 are formed in the bottom emission type or the both-side emission type, It is preferable to use a material having a light-transmitting property to efficiently emit light.

In addition, it is preferable that the light emitted from the pixel portion 201 is a single color, preferably white, and a color filter is formed to overlap the pixel portion 201 to extract light. The color filter may be formed on the substrate 101 or on the counter substrate. It is not necessary to separately coat the EL layer 205 for each pixel portion 201 and the EL layer 205 is formed in a single step without using a metal mask can do.

In the case of the top emission type, a light path length adjustment film (not shown) is formed on the lower electrode layer 203 so as to interfere with the light emission of the top surface from the EL layer 205 and the bottom emission reflected by the lower electrode layer 203, . It is preferable that the optical path length adjusting film has a light transmitting property and does not affect the injection of the carrier into the EL layer 205. [

Here, another embodiment of a display device to which a common wiring according to an aspect of the present invention can be applied will be described with reference to Fig.

13 is a cross-sectional view corresponding to a part of the pixel of the light emitting device.

The light emitting device shown in Fig. 13 emits light in a direction shown by an arrow in Fig. Called top emission structure (top emission structure) in which light is emitted via the substrate 102 formed opposite to the substrate 101 without interposing the substrate 101 on which the EL layer 205 is formed, .

A blue pixel 240a, a green pixel 240b, and a red pixel 240c are formed between the substrate 101 and the substrate 102, as shown in Fig. A transistor 220 for controlling the driving of the light emitting element and a lower electrode layer 203 electrically connected to the transistor 220 through the contact hole formed in the insulating layer 258 are formed on the substrate 101.

The space 260 between the substrate 101 and the substrate 102 is not particularly limited and may have a light transmitting property. However, it is preferable that the space 260 is filled with a material having a translucency greater than that of the space. When the refractive index is small, the light in the oblique direction emitted from the EL layer 205 is further refracted at the interface of the space 260, and in some cases light is emitted from the adjacent pixels. Therefore, as the space 260, for example, a translucent adhesive having a high refractive index capable of bonding the substrate 101 and the substrate 102 can be used. An inert gas such as nitrogen or argon may also be used.

In the present embodiment, the blue pixel 240a has a structure in which a light emitting element having a light emission intensity is formed in at least a blue region, a green pixel 240b has a structure in which a light emitting element having light emission intensity is formed in at least a green region, The pixel 240c has a configuration in which a light emitting element having a light emission intensity is formed in at least a red region.

The EL layer 205 is directly formed on the lower electrode layer 203 and the upper electrode layer 207 is formed on the EL layer 205 in common for the blue pixel 240a, the green pixel 240b and the red pixel 240c .

Thus, the light emitting elements of each pixel (the blue pixel 240a, the green pixel 240b, and the red pixel 240c) have the same configuration.

The substrate 102 also has a light shielding film 252 functioning as a black matrix, a color filter 254 and an overcoat 256 on the substrate 102. The color filter 254 is a colored layer and emits light corresponding to the color of light emitted from each light emitting element (blue, green, red) to the substrate 102 side.

The common wiring having the separation layer can be applied to such a display device. Therefore, the EL layer 205 and the upper electrode layer 207 can be formed at least on the isolation layer using the same metal mask.

In addition, by forming the color filter 254 that emits light from the EL of each light emitting element and emits light emitted from each light emitting element on the upper side, a metal mask for separating and applying the EL layer The number of metal masks and the cost of the manufacturing process can be reduced and the probability of occurrence of problems due to contact between the metal mask and the substrate can be reduced.

As described above, it is necessary to use a metal mask covering the connection portion of the common wiring 111 and the upper electrode layer 107 when the EL layer 105 is formed by using the common wiring of the present invention in the display device And can be formed using a metal mask such as the upper electrode layer 107. [ Therefore, the number of metal masks used in manufacturing the light emitting device 20 is reduced, and the problems caused by the contact between the metal mask and the substrate are reduced, and a highly reliable light emitting device can be obtained.

In addition, the common wiring provided with the separation layer of one embodiment of the present invention can be used as an auxiliary wiring for assisting the conductivity of the upper electrode layer of the light emitting element. Hereinafter, the display device 200 to which the common wiring and the isolation layer are applied to the auxiliary wiring will be described.

7 (A) is a schematic top view of a display device 200 according to an embodiment of the present invention.

The display device 200 has a plurality of pixel portions 201 arranged periodically and a common wiring 211 surrounding the pixel portion 201. 7A shows only one region including the common wiring 211 of the display device 200 and the lower electrode layer 203 and the lower electrode layer 203 are dipped in the pixel portion 201, And only a contact region shown by a circular dashed line is shown.

Fig. 7B is a schematic cross-sectional view taken along the line F-F 'and G-G' shown in Fig. 7A. Section F-F 'is a sectional schematic view of a region including the contact region and the transistor 220 formed in the pixel portion 201, and a cross-sectional view G-G' Sectional view of a region including the common wiring 211 adjacent to the common wiring 211. FIG.

The display device 200 has the same configuration except that it has a common wiring 211 functioning as an auxiliary wiring of the upper electrode layer between the pixel portions 201 adjacent to the display device 20.

The common wiring 211 is formed between the lower electrode layers 203 of the two adjacent pixel units 201 and the end thereof is covered by the barrier ribs 209. On the common wiring 211, a separation layer 213 is formed. And also contacts the upper electrode layer 207 in a part of the region not covered with the partition wall 209 and the separation layer 213 of the common wiring 211. Therefore, the upper electrode layers 207 of the plurality of pixel portions 201 are electrically connected through the common wiring 211. [

In the display device 200, the common wiring 211 may be disposed so as to surround the plurality of pixel portions 201 as in the display device 20. [

In the present embodiment, the common wiring 211 surrounding one pixel portion 201 is exemplified. However, the common wiring 211 is formed so as to surround two or more of the plurality of pixel portions 201 . The common wiring 211 may be arranged only in the vertical direction or in the horizontal direction.

As described above, by applying the common wiring of one embodiment of the present invention to a display device, a potential drop due to the resistance of the upper electrode layer can be suppressed, and a highly reliable display device can be obtained. Further, since the EL layer and the upper electrode layer can be formed without using a metal mask, the problem caused by the contact between the metal mask and the substrate is eliminated, and a highly reliable display device can be obtained.

The present embodiment can be carried out by appropriately combining with other embodiments described in this specification.

(Embodiment 3)

In this embodiment, an example of a top-emitting type lighting apparatus to which the light-emitting device exemplified in Embodiment 1 is applied will be described with reference to Figs. 8 (A) and 8 (B).

In the lighting apparatus 300 shown in Fig. 8A, a plurality of light emitting devices 303 are formed on a first substrate 301a. The first substrate 301a and the second substrate 301b having a translucency opposite to the first substrate 301a are bonded to the sealing member 305a covering the light emitting device 303 and the sealing member 305b formed at the end Thereby forming a bonded structure.

The light emitting device 303 can suitably use the light emitting device exemplified in the first embodiment.

It is preferable to use a substrate having a high thermal conductivity such as a metal substrate for the first substrate 301a. In the case of a large illuminating device using an EL element, heat generation of the EL element may be a problem, and when such a substrate having high heat conductivity is used, the heat radiation property is enhanced. For example, when aluminum oxide, duralumin, etc. are used in addition to a stainless steel substrate, lightness and heat dissipation can be improved. In addition, it is preferable to use a lamination of aluminum and aluminum oxide, a lamination of duralumin and aluminum oxide, a lamination of duralumin and magnesium oxide, etc., so that the surface of the substrate can be made insulating.

A transparent substrate is used for the second substrate 301b. It is also possible to form a concavo-convex shape on the surface of the light emitting device 303 or the surface of the second substrate 301b that intersects the light emission from the light emitting device 303, . For example, a hemispherical lens, a microlens array, a film formed with a concavo-convex structure, a light diffusion film, or the like may be directly formed or a concave-convex shape may be formed.

As the seal members 305a and 305b, a material capable of bonding opposing surfaces can be used. For example, a known sealing material made of a thermosetting material, an ultraviolet curable material, or the like can be used. Particularly, it is preferable to use a material having permeability for the sealing material 305a. These materials are preferably materials that do not transmit impurities such as moisture or oxygen as much as possible. Further, a sealing material containing a desiccant may be used.

The illuminating device 320 shown in Fig. 8B includes a first substrate 301a and a second substrate 301b on which a plurality of light emitting devices 303 formed on the first glass layer 307a are sealed with a second glass layer 307b. And is surrounded by the second substrate 301b.

The first glass layer 307a and the second glass layer 307b are attached using a sealing material 305a and the first substrate 301a and the second substrate 301b are attached using a sealing material 305b have.

The space between the first glass layer 307a and the second glass layer 307b may be filled with an inert gas (nitrogen, argon, or the like) as a filler, or filled with a sealing material having translucency.

Since the light emitting device 303 has a structure in which the light emitting device 303 is sealed by being sandwiched by two thin glass layers, it is possible to suppress intrusion of impurities such as moisture and oxygen from the outside, .

A converter 309 connected to the light emitting device 303 is provided on the first substrate 301a in the illumination devices 300 and 320. [ The converter 309 converts, for example, a power source voltage for home use to a power source voltage for illumination driving. Further, the converter 309 may be formed on the inner side of the seal member 305b.

Further, by using a flexible material such as a plastic or an organic resin film, a thin glass substrate, or a metal thin film as a material of the substrate used for the illumination devices 300 and 320, a lightweight and flexible lighting device can do.

In the present embodiment, the top surface emitting type illumination device has been described. However, for example, in the case of a bottom emission type, a substrate having a light transmitting property may be used for the substrate on the side where the light emitting device is installed.

The present embodiment can be carried out in appropriate combination with other embodiments described in this specification.

(Fourth Embodiment)

In this embodiment, an example of an EL layer which can be applied to an embodiment of the present invention will be described with reference to Figs. 9 (A) to 9 (C).

The EL layer 105 shown in FIG. 9A is formed between the first electrode layer 711 and the second electrode layer 712. The first electrode layer 711 and the second electrode layer 712 may have the same configurations as those of the above embodiment.

The EL layer 105 may include at least a light emitting layer containing an organic compound having luminescent properties. In addition, a layer containing a substance having a high electron-transporting property, a layer containing a substance having a high hole-transporting property, a layer containing a substance having a high electron-injecting property, a layer containing a substance having a high hole- (A material having a high electron transporting property and a high hole transporting property), and the like can be appropriately combined to form a laminated structure. In the present embodiment, the EL layer 105 includes a hole injection layer 701, a hole transport layer 702, a layer 703 containing an organic compound having luminescence, an electron transport layer 704 ), And an electron injection layer 705 are stacked in this order. Alternatively, a laminated structure in which these are inverted may be used.

A manufacturing method of the light emitting element shown in Fig. 9 (A) will be described.

The hole injection layer 701 is a layer containing a substance having a high hole injection property. Examples of the material having high hole injecting property include metal oxides such as molybdenum oxide, titanium oxide, vanadium oxide, rhenium oxide, ruthenium oxide, chromium oxide, zirconium oxide, hafnium oxide, tantalum oxide, silver oxide, tungsten oxide, Can be used. Further, phthalocyanine compounds such as phthalocyanine (abbreviated as H ₂ Pc) and copper (II) phthalocyanine (abbreviation: CuPc) can be used.

In addition, low molecular organic compounds such as 4,4 ', 4 "-tris (N, N-diphenylamino) triphenylamine (abbreviation: TDATA), 4,4' ) -N-phenylamino] triphenylamine (abbreviated as MTDATA), 4,4'-bis [N- (4-diphenylaminophenyl) N'-phenylamino] phenyl} -N-phenylamino) biphenyl (abbreviation: DNTPD), 1,3,5-tris [N Phenylamino] -9-phenylcarbazole (abbrev., DPA3B), 3- [N- (9- (Abbreviation: PCzPCA1), 3,6-bis [N- (9-phenylcarbazol-3-yl) -N-phenylamino] (Naphthyl) -N- (9-phenylcarbazol-3-yl) amino] -9-phenylcarbazole (abbreviation: PCzPCN1).

Further, a polymer compound (oligomer, dendrimer, polymer, etc.) may be used. (Polyvinylcarbazole) (abbreviated as PVK), poly (4-vinyltriphenylamine) (abbreviation: PVTPA), poly [N- (4- { Phenyl) -N, N'-bis (phenyl) phenyl] -N'-phenylamino} phenyl) methacrylamide] (abbreviation: PTPDMA), poly [N, N'- And benzidine (abbreviation: Poly-TPD). Further, a polymer compound to which an acid is added such as poly (3,4-ethylenedioxythiophene) / poly (styrenesulfonic acid) (PEDOT / PSS) and polyaniline / poly (styrene sulfonic acid) have.

Particularly, as the hole injection layer 701, it is preferable to use a composite material containing an acceptor material in an organic compound having a high hole transporting property. By using a composite material containing an acceptor material in a material having high hole transportability, the hole injecting property from the first electrode layer 711 can be improved and the driving voltage of the light emitting element can be reduced. These composite materials can be formed by co-depositing a material having high hole transportability and an acceptor material. Holes can be easily injected from the first electrode layer 711 into the EL layer 105 by forming the hole injection layer 701 using the composite material.

As the organic compound used for the composite material, various compounds such as an aromatic amine compound, a carbazole derivative, an aromatic hydrocarbon, a polymer compound (oligomer, dendrimer, polymer, etc.) can be used. The organic compound used for the composite material is preferably an organic compound having a high hole-transporting property. Specifically, it is preferable that the material has a hole mobility of 10 ^-6 cm ² / Vs or more. However, materials other than these may be used as long as they are substances having higher hole transportability than electrons. Hereinafter, organic compounds usable for the composite material are specifically listed.

As organic compounds usable for the composite material, for example, TDATA, MTDATA, DPAB, DNTPD, DPA3B, PCzPCA1, PCzPCA2, PCzPCN1, 4,4'-bis [N- (1-naphthyl) Biphenyl (abbreviated as NPB or? -NPD), N, N'-bis (3-methylphenyl) -N, N'-diphenyl- [ (TPD) and 4-phenyl-4 '- (9-phenylfluorene-9-yl) triphenylamine (abbreviation: BPAFLP) (Abbreviated as "CBP"), 1,3,5-tris [4- (N-carbazolyl) phenyl] benzene ] -9H-carbazole (abbreviation: CzPA), 9-phenyl-3- [4- (10- 4- (N-carbazolyl) phenyl] -2,3,5,6-tetraphenylbenzene.

Further, 2-tert - butyl-9,10-di (2-naphthyl) anthracene (abbreviation: t-BuDNA), 2-tert - butyl-9,10-di (1-naphthyl) anthracene, 9,10 Di- tert -butyl-9,10-bis (4-phenylphenyl) anthracene (abbreviated as t- BuDBA), 9,10- Tert -butyl anthracene (abbreviated as t-BuAnth), 9,10-bis (4-methyl-1-naphthyl) - naphthyl) anthracene (abbreviation: DMNA), 9,10-bis [2- (1-naphthyl) phenyl] -2- tert-butyl anthracene, 9,10-bis [2- (1-naphthyl) phenyl ] Anthracene, and 2,3,6,7-tetramethyl-9,10-di (1-naphthyl) anthracene.

Further, it is also possible to use 2,3,6,7-tetramethyl-9,10-di (2-naphthyl) anthracene, 9,9'-bianthryl, 10,10'-diphenyl- 10,10'-bis [(2,3,4,5,6-pentaphenyl) phenyl] -9,9'-bipyridyl, Bianco Trill, anthracene, tetracene, rubrene, perylene, 2,5,8,11-tetra (tert - butyl) perylene, pentacene, coronene, 4,4'-bis (2,2-diphenyl Aromatic vinyl compounds such as vinylidenebiphenyl (hereinafter abbreviated as DPVBi) and 9,10-bis [4- (2,2-diphenylvinyl) phenyl] anthracene (DPVPA).

Examples of the electron acceptor include organic compounds such as 7,7,8,8-tetracyano-2,3,5,6-tetrafluoroquinodimethane (abbreviation: F ₄ -TCNQ) and chloranil, transition metal oxides . And oxides of metals belonging to Groups 4 to 8 of the Periodic Table of Elements. Concretely, vanadium oxide, niobium oxide, tantalum oxide, chromium oxide, molybdenum oxide, tungsten oxide, manganese oxide and rhenium oxide are preferable because of their high electron acceptance. Among them, molybdenum oxide is particularly preferable because it is stable in the atmosphere, has low hygroscopicity and is easy to handle.

Further, a composite material may be formed using the above-described polymeric compound such as PVK, PVTPA, PTPDMA, or Poly-TPD and the above-described electron acceptor, and used in the hole injection layer 701.

The hole transport layer 702 is a layer containing a substance having high hole transportability. Examples of the material having high hole transportability include NPB, TPD, BPAFLP, 4,4'-bis [N- (9,9-dimethylfluoren-2-yl) -N-phenylamino] biphenyl (abbreviation: DFLDPBi Aromatic amine compounds such as 4,4'-bis [N- (spiro-9,9'-biphenyl-2-yl) -N-phenylamino] biphenyl (abbreviation: BSPB) The material described herein is a material having a hole mobility of at least 10 ^-6 cm ² / Vs. However, materials other than these may be used as long as they are substances having higher hole transportability than electrons. Further, the layer containing a substance having a high hole-transporting property is not limited to a single layer, and two or more layers made of the above substance may be laminated.

Carbazole derivatives such as CBP, CzPA, and PCzPA, and anthracene derivatives such as t-BuDNA, DNA, and DPAnth may be used for the hole transport layer 702.

Also, a polymer compound such as PVK, PVTPA, PTPDMA, or Poly-TPD may be used for the hole transport layer 702. [

As the layer 703 containing an organic compound having luminous properties, a fluorescent compound that emits fluorescence or a phosphorescent compound that emits phosphorescence may be used.

Examples of the fluorescent compound that can be used for the layer 703 containing an organic compound having a luminescent property include N, N'-bis [4- (9H-carbazol-9-yl) phenyl] Diamine (abbreviated as YGA2S), 4- (9H-carbazol-9-yl) -4'- (10- phenyl-9-anthryl) Phenylamine (abbreviation: YGAPA) and 4- (10-phenyl-9-anthryl) -4 ' have. As the luminescent material of green system, it is also possible to use N- (9,10-diphenyl-2-anthryl) -N, 9-diphenyl-9H-carbazol- , 9-diphenyl-9H-carbazole-3-amine (abbreviation: 2PCABPhA), N- (9,10-biphenyl- N, N'-triphenyl-1,4-phenylenediamine (abbreviation: 2DPAPA), N- [9,10-bis (1,1'- Phenylenediamine (abbreviation: 2DPABPhA), 9,10-bis (1,1'-biphenyl 2-yl) -N- [4- (9H-carbazol-9-yl) phenyl] Amine (abbreviation: DPhAPhA), and the like. As the yellow light emitting material, rubrene, 5,12-bis (1,1'-biphenyl-4-yl) -6,11-diphenyltetracene (abbreviation: BPT) and the like can be given. Examples of the red light-emitting material include N, N, N ', N'-tetrakis (4-methylphenyl) tetracen-5,11- diamine (abbreviated as p- mPhTD), 7,14- , N ', N'-tetrakis (4-methylphenyl) acenaphtho [1,2-a] fluoranthene-3,10-diamine (abbreviation: p-mPhAFD).

Examples of the phosphorescent compound that can be used for the layer 703 containing an organic compound having luminescence include bis [2- (4 ', 6'-difluorophenyl) pyridine Dina sat -N, C ^{2 ']} iridium (III) tetrakis (1-pyrazolyl) borate (abbreviation: FIr6), bis [2- (4', 6'-difluorophenyl) pyrimidin Dina sat -N, C ^{2 ']} iridium (III) picolinate (abbreviation: FIrpic), bis {2- [3', 5'-bis (trifluoromethyl) phenyl] pyrimidin Dina sat -N, C ^{2 '}} iridium (III ) Picolinate (abbreviated as Ir (CF ₃ ppy) ₂ (pic)), bis [2- (4 ', 6'-difluorophenyl) pyridinate-N, C ^2' ] iridium Acetonate (abbreviation: FIr (acac)) and the like. Further, as a green light-emitting material, tris (2-phenyl-pyrido Dina sat -N, C ^{2 ')} iridium (III) (Ir (ppy) 3), bis (2-phenyl-pyrido Dina sat -N, C ^2') Iridium (III) acetylacetonate (abbreviated as Ir (ppy) ₂ (acac)), bis (1,2-diphenyl-1H-benzimidazolato) iridium ) ₂ (acac)), bis (benzo [h] quinolinato) iridium (III) acetylacetonate (Ir (bzq) ₂ (acac)), tris (benzo [h] quinolinato) iridium (III) ( (Abbreviation: Ir (bzq) ₃ ). (2,4-diphenyl-1,3-oxazolato-N, C ^{2 '} ) iridium (III) acetylacetonate (abbreviation: Ir (dpo) ₂ (acac)) as the yellow light- bis {2- (4 ' perfluorinated phenyl) phenyl] pyrimidin Dina sat -N, C ^{2 '}} iridium (III) acetylacetonate (abbreviation: Ir (p-PF-ph ) 2 (acac)), bis (2-phenylbenzothiazolato-N, C ^{2 '} ) iridium (III) acetylacetonate (abbreviated as Ir (bt) ₂ (acac)), bis (acetylacetonate) Ir (Fdppr-Me) ₂ (acac), (acetylacetonate) bis {2- (4-methoxyphenyl) -3,5 -Dimethylpyrazinate} iridium (III) (abbreviation: Ir (dmmoppr) ₂ (acac)). (2-phenylquinolinato-N, C ^{2 '} ) iridium (III) (abbreviation: Ir (pq) ₃ ), bis ^{2 '} ) iridium (III) acetylacetonate (abbreviated as Ir (pq) ₂ (acac)), (acetylacetonate) bis (3,5- _{Ir (mppr-Me) 2 (} acac)), ( acetylacetonato) bis (5-isopropyl-3-methyl-2-phenyl-pyrazol through Saturday) iridium (III) _{(abbreviation: Ir (mppr-iPr) 2} ( acac)) and the like. Ir (btp) 2 (2'-benzo [4,5- alpha -thienyl) pyridinate-N, C ^{3 '} ] iridium (III) acetylacetonate ₂ (acac)), bis (1-phenylisoquinoline quinolinato -N, C ^{2 ')} iridium (III) acetylacetonate (abbreviation: Ir (piq) ₂ (acac)), (acetylacetonato) bis [2 , 3-bis (4-fluorophenyl) quinoxaline Salina Sat] iridium (III) (abbreviation: Ir (Fdpq) ₂ (acac)), (acetylacetonato) bis (2,3,5-triphenyl-pyrazol through Saturday) iridium (III) _{(abbreviation: Ir (tppr) 2 (acac} )), ( Diffie just one meta NATO) bis (2,3,5-triphenyl-pyrazol through Saturday) iridium (III) (abbreviation: Ir (tppr) ₂ (dpm)), 2,3,7,8,12,13,17,18--octaethyl -21 H, 23 H - porphine platinum (II) (abbreviation: PtOEP, etc.) and organic metal complex. In addition, it is also possible to use tris (acetylacetonate) (monophenanthroline) terbium (III) (abbreviation: Tb (acac) ₃ (Phen)), tris (1,3-diphenyl-1,3-propanedionato) Eu (DBM) ₃ (Phen), tris [1- (2-decenoyl) -3,3,3-trifluoroacetonato] (monophenanthroline) The rare earth metal complex such as europium (III) (abbreviation: Eu (TTA) ₃ (Phen)) can be used as a phosphorescent compound since it emits light from rare earth metal ions (electron transfer between other multiplets).

As the layer 703 containing an organic compound having luminescence, the organic compound (guest material) having the above-described luminescence may be dispersed in another material (host material). As the host material, various materials can be used, and it is preferable to use a material having a lowest unoccupied molecular orbital level (LUMO level) and a lowest occupied molecular orbital level (HOMO level) than a material having a luminescent property.

As the host material, specifically, tris (8-quinolinolato) aluminum (III) (abbreviation: Alq), tris (4-methyl-8-quinolinolato) aluminum (III) (abbreviation: Almq _3), bis (10-hydroxybenzo [ h ] quinolinato) beryllium (II) (abbreviated as BeBq ₂ ), bis (2-methyl-8- quinolinolato) Bis (2-benzooxazolyl) phenolato] zinc (II) (abbreviated as ZnPBO), bis [2 (benzooxazolyl) phenolato] - (2-benzothiazolyl) phenol gelato] zinc (II) (abbreviation: ZnBTZ), and so on of the metal complex, 2- (4-biphenylyl) -5- (4-tert-butylphenyl) -1,3, Oxadiazole (abbreviation: PBD), 1,3-bis [5- ( p - tert -butylphenyl) -1,3,4-oxadiazol- Tetrazole (abbreviation: TAZ), 2,2 ', 2 "- (1 (1- tert -butylphenyl) such as BCP): TPBI), Lancet phenanthroline (abbreviation:: BPhen), Lancet queue pro (abbreviation benzimidazole) (abbreviation; -, 3,5-benzenetricarboxylic yl) tris (1-phenyl -1 H Or a heterocyclic compound, 9- [4- (10-phenyl-9-anthryl) phenyl] -9 H-carbazole (abbreviation: CzPA), 3,6- diphenyl-9- [4- (10-phenyl- 9-anthryl) phenyl] -9 H - carbazole (abbreviation: DPCzPA), 9,10- bis (3,5-di-phenylphenyl) anthracene (abbreviation: DPPA), 9,10- di (2-naphthyl Anthracene (abbreviation: DNA), 2- tert -butyl-9,10-di (2-naphthyl) anthracene (abbreviated as t- BuDNA), 9,9'- (Abbreviation: DPNS), 9,9 '- (stilbene-4,4'-diyl) diphenanthrene (abbreviation: DPNS2), 3,3 Diphenyl anthracene (abbreviation: DPAnth), 6,12-dimethoxy-5,11-di (benzene-1,3,5-triyl) condensed aromatic compounds such as phenyl chrysene, N, N - diphenyl-9- [4- (10-phenyl-9-anthryl) phenyl] -9 H - carbazole-3-amine (abbreviation: CzA1PA), 4 - (10-phenyl-9-anthryl) triphenylamine (abbreviation: DPhPA), N, 9- diphenyl - N - [4- (10-phenyl-9-anthryl) phenyl] -9 H-carbazole 3-amine (abbreviation: PCAPA), N , 9-diphenyl- N- {4- [4- (10- phenyl- Carbonyl} -9 H - carbazole-3-amine (abbreviation: PCAPBA), N - (9,10-diphenyl-casting reel not -2-) - N, 9- diphenyl -9 H - carbazole-3-amine (Abbreviation: 2PCAPA), NPB (or alpha -NPD), TPD, DFLDPBi, and BSPB.

A plurality of types of host materials can be used. For example, a substance for inhibiting crystallization such as rubrene may be further added to suppress crystallization. Further, NPB, Alq, or the like may be further added so as to more efficiently transfer energy to the guest material.

By making the guest material to be dispersed in the host material, crystallization of the layer 703 containing the organic compound having luminescence can be suppressed. In addition, concentration extinction due to the high concentration of the guest material can be suppressed.

Further, a polymer compound may be used as the layer 703 containing an organic compound having a light emitting property. Specifically, as a blue light emitting material, there are a poly (9,9-dioctylfluorene-2,7-diyl) (abbreviation: PFO), a poly [(9,9-dioctylfluorene- ) -co- (2,5-dimethoxybenzene-1,4-diyl) (abbreviation: PF-DMOP), poly {(9,9-dioctylfluorene- N, N'-di- (p-butylphenyl) -1,4-diaminobenzene]} (abbreviation: TAB-PFH). Further, as a green light emitting material, poly (p-phenylenevinylene) (abbreviated as PPV), poly [(9,9-dihexylfluorene-2,7-diyl) 2,1,3] thiadiazole-4,7-diyl) (abbreviation: PFBT), poly [(9,9-dioctyl-2,7-divinylene fluorene) -alt- -Methoxy-5- (2-ethylhexyloxy) -1,4-phenylene)]. (2'-ethylhexoxy) -1,4-phenylenevinylene] (abbreviation: MEH-PPV), poly (3-butyl Di-n-butyl-2, 5-diyl) (abbreviation: R4-PAT), poly {[9,9-dihexyl- Phenyl)], poly {[2-methoxy-5- (2-ethylhexyloxy) -1,4-bis (Abbreviation: CN-PPV-DPD), etc.) and the like, and the like, .

Further, by forming a plurality of layers containing an organic compound having luminescence and making the luminescent colors of the respective layers different from each other, luminescence of a desired color can be obtained as a whole of the luminescent element. For example, in a light-emitting device having two layers including an organic compound having luminous properties, the luminous color of the layer containing the organic compound having the first luminous property and the luminous color of the layer containing the organic compound having the second luminous property By making the relation of this complementary color, the light emitting element which emits white light as the whole light emitting element can be obtained. "Complementary color" means the relationship between achromatic colors when they are mixed. That is, when light obtained from a substance emitting light of a complementary color is mixed, white light emission can be obtained. This also applies to the case of a light-emitting device having three or more layers including an organic compound having a light-emitting property.

The electron transporting layer 704 is a layer containing a substance having a high electron transporting property. (8-quinolinolato) aluminum (abbreviated as Alq), tris (4-methyl-8-quinolinolato) aluminum (abbreviation Almq ₃ ), bis (10- Quinoline skeleton such as hydroxybenzo [h] -quinolinato) beryllium (abbreviated as BeBq ₂ ), bis (2-methyl-8-quinolinolato) (4-phenylphenolato) aluminum And metal complexes having a benzoquinoline skeleton. Further, in addition to the above, bis [2- (2-hydroxyphenyl) -benzooxazolato] zinc (abbreviated as Zn (BOX) ₂ ) Zinc (abbreviated as Zn (BTZ) ₂ ), and the like can also be used. Further, in addition to the metal complexes, 2- (4-biphenyl) -5- (4- tert -butylphenyl) -1,3,4-oxadiazole (abbreviation: PBD) - (p- tert - butylphenyl) -1,3,4-oxadiazole-2-yl] benzene (abbreviation: OXD-7), 3- ( 4- biphenylyl) -4-phenyl-5- ( 4- tert -butylphenyl) -1,2,4-triazole (abbreviated as TAZ), basophenanthroline (abbreviated as BPhen), and bathocuproin (abbreviation: BCP). The materials here are mainly those with electron mobility of 10 ^-6 cm ² / Vs or more. Further, the electron transporting layer may be formed not only of a single layer but also of two or more layers made of the above material.

The electron injection layer 705 is a layer containing a substance having a high electron injecting property. The electron injection layer 705 may be made of an alkali metal, an alkaline earth metal, or a compound thereof such as lithium, cesium, calcium, lithium fluoride, cesium fluoride, calcium fluoride, lithium oxide, and the like. Further, a rare earth metal compound such as erbium fluoride can be used. In addition, a material constituting the above-described electron transporting layer 704 may be used.

The hole injection layer 701, the hole transport layer 702, the layer 703 containing an organic compound having luminescence, the electron transport layer 704 and the electron injection layer 705 are formed by vapor deposition (vacuum deposition) ), An inkjet method, a coating method, or the like.

As shown in Fig. 9 (B), a plurality of EL layers may be stacked between the first electrode layer 711 and the second electrode layer 712. [ In this case, it is preferable to form the charge generation layer 803 between the stacked first EL layer 800 and the second EL layer 801. The charge generation layer 803 can be formed of the above-described composite material. The charge generation layer 803 may have a stacked structure of layers made of a composite material and layers made of different materials. In this case, as a layer made of another material, a layer including an electron-donating material and a substance having a high electron-transporting property, a layer made of a transparent conductive film, or the like can be used. The light emitting device having such a configuration is not easily caused by problems such as energy transfer and extinction, and it is easy to make a light emitting device having both a high luminous efficiency and a long lifetime by widening the choice of material . It is also easy to obtain phosphorescence emission from one EL layer and fluorescence emission from the other EL layer. This structure can be used in combination with the above-described structure of the EL layer.

Further, by making the luminescent colors of the respective EL layers different from each other, luminescence of a desired color can be obtained as a whole of the luminescent element. For example, in a light-emitting element having two EL layers, it is possible to obtain a light-emitting element that emits white light as the whole light-emitting element by making the light-emitting color of the first EL layer and the light-emitting color of the second EL layer co- "Complementary color" refers to the relationship between achromatic colors when they are mixed. That is, when light obtained from a substance emitting light of a complementary color is mixed, white light emission can be obtained. The same applies to the case of a light emitting element having three or more EL layers.

9 (C), the EL layer 105 includes a hole injection layer 701, a hole transport layer 702, and an organic compound having a luminescent property between the first electrode layer 711 and the second electrode layer 712 And a second electrode layer 712 which are in contact with the first electrode layer 712 and the second electrode layer 712. The layer 703 including the electron injection layer 703, the electron transport layer 704, the electron injection buffer layer 706, the electron relay layer 707, (708).

By forming the composite material layer 708 in contact with the second electrode layer 712, damage to the EL layer 105 can be reduced particularly when the second electrode layer 712 is formed by using the sputtering method, which is preferable . The composite material layer 708 may be a composite material containing an acceptor material in the above-described organic compound having a high hole-transporting property.

Since the electron injection buffer layer 706 can be formed to reduce the injection barrier between the composite material layer 708 and the electron transport layer 704, electrons generated in the composite material layer 708 can be emitted to the electron transport layer 704, As shown in FIG.

The electron injection buffer layer 706 may contain an alkali metal, an alkaline earth metal, a rare earth metal and a compound thereof (an alkali metal compound (including an oxide such as lithium oxide, a halide, a carbonate such as lithium carbonate or cesium carbonate) (Including oxides, halides, and carbonates), or compounds of rare earth metals (including oxides, halides, and carbonates).

In addition, when the electron injection buffer layer 706 is formed to include a material having a high electron transporting property and a donor substance, the electron donating buffer layer 706 may be formed so as to be contained in a ratio of 0.001 to 0.1, It is preferable to add a substance. Examples of the donor material include alkali metals, alkaline earth metals, rare earth metals, and compounds thereof (alkali metal compounds (including oxides such as lithium oxide, halides, carbonates such as lithium carbonate and cesium carbonate), alkaline earth metal compounds (Abbreviated as TTN), nickelocene, decamethylanthracene (hereinafter, referred to as &quot; tetramethylcyclopentasilane &quot;), as well as compounds of rare earth metals (including oxides, halides, and carbonates) May be used. The material having high electron transportability can be formed using the same material as that of the electron transport layer 704 described above.

Further, it is preferable to form the electronic relay layer 707 between the electron injection buffer layer 706 and the composite material layer 708. [ It is not always necessary to form the electron relay layer 707. However, by forming the electron relay layer 707 having high electron transportability, electrons can be rapidly transported to the electron injection buffer layer 706. [

The structure in which the electron relay layer 707 is sandwiched between the composite material layer 708 and the electron injection buffer layer 706 is a structure in which the acceptor material contained in the composite material layer 708 and the donor It is a structure in which substances are difficult to interact and difficult to interfere with each other. Therefore, it is possible to prevent the drive voltage from rising.

The electron relay layer 707 contains a substance having a high electron transporting property and the LUMO level of the substance having a high electron transporting property is contained in the LUMO level of the acceptor substance contained in the composite material layer 708 and in the electron transporting layer 704 Is formed between the LUMO states of the high-electron-transporting substance. When the electron relay layer 707 contains a donor material, the donor level of the donor material is also controlled by the LUMO level of the acceptor material in the composite material layer 708 and the LUMO level of the acceptor material in the electron transport layer 704 Is positioned between the LUMO levels of the high-electron-transporting substance. As the specific energy level, the LUMO level of the substance having a high electron transporting property contained in the electron relay layer 707 may be -5.0 eV or more, preferably -5.0 eV or more and -3.0 eV or less.

As the electron-transporting substance contained in the electron relay layer 707, a phthalocyanine-based material or a metal complex having a metal-oxygen bond and an aromatic ligand is preferably used.

As the phthalocyanine-based material contained in the electron relay layer 707, specifically, CuPc, SnPc (Phthalocyanine tin (II) complex), ZnPc (Phthalocyanine zinc complex), CoPc (Cobalt (II) phthalocyanine, β -form), FePc Phthalocyanine Iron, and PhO-VOPc (vanadyl 2,9,16,23-tetraphenoxy-29H, 31H-phthalocyanine) are preferably used.

As the metal complex having the metal-oxygen bond and the aromatic ligand included in the electron relay layer 707, it is preferable to use a metal complex having a metal-oxygen double bond. Since the double bond of the metal-oxygen has an acceptor property (a property that facilitates acceptance of electrons), the movement (transfer) of electrons becomes easier. It is also considered that the metal complex having a double bond of metal-oxygen is stable. Therefore, by using a metal complex having a metal-oxygen double bond, the light emitting element can be driven more stably at a low voltage.

As the metal complex having a metal-oxygen bond and an aromatic ligand, a phthalocyanine-based material is preferable. Specifically, any of VOPc (vanadyl phthalocyanine), SnOPc (phthalocyanine tin (IV) oxide complex), and TiOPc (Phthalocyanine titanium oxide complex) has a molecular structure in which the double bond of metal- The acceptance property is high.

As the above-mentioned phthalocyanine-based material, those having a phenoxy group are preferable. Specifically, a phthalocyanine derivative having a phenoxy group such as PhO-VOPc is preferable. The phthalocyanine derivative having a povidoxy group can be dissolved in a solvent. Thus, it has an advantage that it is easy to handle for forming a light emitting element. In addition, since it can be dissolved in a solvent, it has an advantage that maintenance of a device used for film formation is facilitated.

The electronic relay layer 707 may further contain a donor material. Examples of the donor material include alkali metals, alkaline earth metals, rare earth metals, and compounds thereof (alkali metal compounds (including oxides such as lithium oxide, halides, carbonates such as lithium carbonate and cesium carbonate), alkaline earth metal compounds Organic compounds such as tetrathianaphthacene (abbreviated as TTN), nickelocene, and decamethylnickelocene, as well as rare earth metal compounds (including oxides, halides, and carbonates) Can be used. By including the donor material in the electronic relay layer 707, electrons are easily moved, and the light emitting device can be driven at a lower voltage.

When a donor material is contained in the electronic relay layer 707, a material having a LUMO level higher than the acceptor level of the acceptor material contained in the composite material layer 708, other than the above- Can be used. As the specific energy level, it is preferable to use a material having a LUMO level in the range of -5.0 eV or more, preferably -5.0 eV or more and -3.0 eV or less. Examples of such a substance include perylene derivatives and nitrogen-containing condensed aromatic compounds. Further, since the nitrogen-containing condensed aromatic compound is stable, it is a preferable material for forming the electronic relay layer 707.

Specific examples of the perylene derivatives include 3,4,9,10-perylene tetracarboxylic dianhydride (abbreviated as PTCDA), 3,4,9,10-perylene tetracarboxylic bisbenzimidazole (abbreviation: PTCBI), N, N'-dioctyl-3,4,9,10-perylenetetracarboxylic acid diimide (abbreviated as PTCDI-C8H), N, N'-dihexyl- And perylene tetracarboxylic acid diimide (abbreviation: HexPTC).

Specific examples of the nitrogen-containing condensed aromatic compound include pyrazino [2,3-f] [1,10] phenanthroline-2,3-dicarbonitrile (abbreviation: PPDN) Hexaazatriene-1,4,5,8,9,12-hexaazatriphenylene (abbreviation: HAT (CN) ₆ ), 2,3-diphenylpyrido [2,3- b] Pyrazine (abbreviation: 2PYPR) and 2,3-bis (4-fluorophenyl) pyrido [2,3-b] pyrazine (abbreviation: F2PYPR).

In addition, there can be mentioned 7,7,8,8-tetracyanoquinodimethane (abbreviated as TCNQ), 1,4,5,8-naphthalene tetracarboxylic acid dianhydride (abbreviated as NTCDA), perfluoropentacene , Copper hexadecafluorophthalocyanine (abbreviation: F ₁₆ CuPc), N, N'-bis (2,2,3,3,4,4,5,5,6,6,7,7,8,8, Naphthalenetetracarboxylic acid diimide (abbreviation: NTCDI-C8F), 3 ', 4'-dibutyl-5,5'-bis (dicyanomethylene ) -5,5'-dihydro-2,2 ': 5', 2 "-terthiophene (abbreviated as DCMT), methanopullerine (for example, [6,6] -phenyl C ₆₁ butyric acid methyl ester ) Can be used.

When the donor material is included in the electromagnetic relay layer 707, the electromagnetic relay layer 707 may be formed by co-deposition of a material having a high electron transporting property and a donor material.

The hole injecting layer 701, the hole transporting layer 702, the layer 703 containing an organic compound having luminescence, and the electron transporting layer 704 may be formed using the above-described materials.

The EL layer 105 of the present embodiment can be manufactured as described above.

The present embodiment can be carried out by appropriately combining with other embodiments described in this specification.

(Embodiment 5)

In this embodiment, an example of a lighting apparatus completed using a light emitting device of one embodiment of the present invention will be described with reference to Figs. 10 (A) and 10 (B).

According to an aspect of the present invention, a lighting apparatus having a light emitting portion having a curved surface can be realized.

One aspect of the present invention is applicable to automobile lighting, for example, lighting can be installed on a dashboard or a ceiling.

Fig. 10A shows an indoor lighting device 901, a desk lighting device 903, and a planar lighting device 904, to which an embodiment of the present invention is applied. Since the light emitting device can also be large-sized, it can be used as a large-area illumination device. In addition, since the thickness is thin, it can be mounted on a wall. Alternatively, it may be used as a roll type lighting device 902.

Fig. 10B shows an example of another illumination device. 10 (B) includes an illumination section 9501, a support column 9503, a support table 9505, and the like. The illumination unit 9501 includes a light emitting device of one embodiment of the present invention. As described above, according to an aspect of the present invention, it is possible to realize a lighting device having a curved surface or a flexible lighting device. Thus, by using the flexible light emitting device as the lighting device, not only the degree of freedom of design of the lighting device is improved, but also the lighting device can be installed in a place having a curved surface such as a ceiling or a dashboard of an automobile.

The present embodiment can be carried out by appropriately combining with other embodiments described in this specification.

(Embodiment 6)

In this embodiment, an electronic apparatus to which the light emitting device manufactured in the above embodiment is applied will be described with reference to Figs. 11 (A) to 11 (C).

As a semiconductor device to which the light emitting device manufactured in the above embodiment is applied, various electronic devices (including a game machine) can be mentioned. Examples of the electronic device include a television device (also referred to as a television or a television receiver), a monitor for a computer or the like, a digital camera, a digital video camera, a digital photo frame, a mobile phone (also referred to as a mobile phone, A portable game machine, a portable information terminal, a sound reproducing device, and a pachinko machine.

11 (A) shows an example of a television apparatus. In the television device 500, the display portion 503 is inserted into the housing 501. The display unit 503 can display an image. Here, the structure in which the housing 501 is supported by the stand 505 is shown.

The operation of the television apparatus 500 can be performed by an operation switch provided in the housing 501 or a separate remote controller 510. [ The channel and the volume can be adjusted by the operation keys 509 of the remote control operator 510 and the image displayed on the display unit 503 can be operated. The remote control operator 510 may be provided with a display unit 507 for displaying information output from the remote control operator 510. [

Further, the television apparatus 500 has a configuration including a receiver, a modem, and the like. (Receiver to receiver) or bidirectional (between transmitter and receiver, or between receivers, etc.) by connecting to a wired or wireless communication network through a modem and receiving general television broadcasting by a receiver Communication can be performed.

11 (B) shows an example of a digital photo frame. For example, the digital photo frame 520 has a housing 521 with a display portion 523 incorporated therein. The display unit 523 can display various images, and can display the image data photographed by a digital camera or the like, for example, to function as a general photo frame.

The digital photo frame 520 is configured to include an operation unit, an external connection terminal (a terminal that can be connected to various cables such as a USB terminal and a USB cable), a recording medium insertion unit, and the like. These structures may be combined on the same surface as the display portion, but it is preferable that they are provided on the side surface or the back surface because the designability is improved. For example, a memory that stores image data photographed with a digital camera may be inserted into the recording medium inserting section of the digital photo frame to acquire image data, and the acquired image data may be displayed on the display section 523. [

In addition, the digital photo frame 520 may be configured to transmit and receive information wirelessly. It is also possible to adopt a configuration in which data of a desired image is acquired by radio and displayed.

11 (C) is a perspective view showing an example of a portable computer.

The portable computer 540 shown in Fig. 11C includes an upper housing 541 having a display portion 543 in a closed state and a hinge unit connecting the upper housing 541 and the lower housing 542, The hinge unit is opened and the input operation is performed while viewing the display unit 543. In this case, the lower housing 542 having the lower housing 542 with the hinge unit 542 can be overlapped, .

Further, the lower housing 542 has a pointing device 546 for performing an input operation in addition to the key board 544. [ When the display section 543 is a touch input panel, an input operation can be performed by touching a part of the display section. Further, the lower housing 542 has a calculation function unit such as a CPU or a hard disk. Further, the lower housing 542 has an external connection port 545 into which a communication cable conforming to a communication standard of another device, for example, USB, is inserted.

The upper housing 541 also has a display portion 547 that can be slidably housed in the upper housing 541, thereby realizing a wider display screen. In addition, the user can adjust the orientation of the screen of the display section 547 which can be stored. Further, when the display portion 547 capable of being stored is a touch input panel, an input operation can be performed by touching a part of the receivable display portion.

In addition, the portable computer 540 in Fig. 11 (C) has a receiver and the like, and can receive a television broadcast and display an image on the display unit. The display unit 547 is slid to expose the entire surface of the screen while the hinge unit for connecting the upper housing 541 and the lower housing 542 is closed, It is possible. In this case, since only the circuit for displaying the television broadcast is started without displaying the display unit 543 with the hinge unit opened, the power consumption can be minimized and the portable computer with limited battery capacity useful.

By applying the display device exemplified in the above embodiment to each display portion in a semiconductor device such as an electronic device, a highly reliable semiconductor device can be realized.

The present embodiment can be carried out in appropriate combination with the other embodiments described in this specification.

10: Light emitting device
100: Light emitting device
101: substrate
102: substrate
103: Lower electrode layer
105: EL layer
107: upper electrode layer
109:
111: Common wiring
113: separation layer
115: separation layer
117: organic resin film
119: Mask
121: Exposure light
123: Auxiliary wiring
125:
131: separation layer
133: separation layer
135: separation layer
135a:
135b:
137: separation layer
137a: Each part
137b:
150a: Light emitting device
150b: Light emitting device
153: insulating layer
160a: Light emitting device
160b: Light emitting device
160c: Light emitting device
160d: Light emitting device
161: Connection
20: Display device
200: display device
201:
203: lower electrode layer
205: EL layer
207: upper electrode layer
209: upper electrode layer
211: upper electrode layer
213: separation layer
220: transistor
221: Just under the membrane
223: semiconductor layer
225: gate electrode
227: first electrode
229: second electrode
231: first insulating layer
233: second insulating layer
240a: blue pixel
240b: green pixel
240c: Red pixel
252:
254: Color filter
256: Overcoat
258: Overcoat
260: Space
300: Lighting device
301a: first substrate
301b: second substrate
303: Light emitting device
305a: Seal material
305b: seal material
307a: first glass layer
307b: second glass layer
309: Converter
320: Lighting device
500: television device
501: housing
503:
505: Stand
507:
509: Operation keys
510: remote controller
520: Digital Photo Frame
521: Housing
523:
540: portable computer
541: upper housing
542: Lower housing
543:
544: Keyboard
545: External connection port
546: Pointing device
547:
701: Hole injection layer
702: hole transport layer
703: A layer containing an organic compound having luminous properties
704: electron transport layer
705: electron injection layer
706: electron injection buffer layer
707: Electronic relay layer
708: Composite layer
800: first EL layer
801: Second EL layer
803: first EL layer
901: Lighting system
902: Lighting device
903: Table lamp
904: Planar illumination device
9501:
9503: Holding
9505: Support

Claims (12)

A wiring;
A first insulation layer overlying a first portion of the wiring;
As the first light emitting element
A first electrode layer provided on an insulating surface such as the wiring;
A first light emitting layer on the first electrode layer;
The first light emitting element including a second electrode layer on the first light emitting layer provided in contact with the second portion of the wiring;
An organic compound layer covering the first insulating layer;
And a conductive layer covering the organic compound layer and including the same material as the second electrode layer,
And the second portion of the wiring overlaps with at least a part of the first insulating layer.
A wiring;
A first insulation layer overlying a first portion of the wiring;
As the first light emitting element
A first electrode layer provided on an insulating surface such as the wiring;
A first light emitting layer on the first electrode layer;
The first light emitting element including a second electrode layer on the first light emitting layer provided in contact with the second portion of the wiring;
As the second light emitting element
The third electrode layer having a second electrode layer of the first light emitting device provided as a third electrode layer on a third portion of the third electrode layer;
A second light emitting layer on the third electrode layer;
The second light emitting element including a fourth electrode layer on the second light emitting layer;
And a second insulation layer overlying a fourth portion of the third electrode layer,
The second portion of the wiring overlaps at least part of the first insulating layer,
And the third portion of the third electrode layer at least partially overlaps the second insulating layer.
3. The method according to claim 1 or 2,
Wherein the first insulating layer has an inverted tapered shape.
The method according to claim 1,
A third electrode layer;
A second light emitting layer on the third electrode layer;
And a second light emitting element including a fourth electrode layer on the second light emitting layer,
Wherein the wiring is provided between the first electrode layer and the third electrode layer,
Wherein the fourth electrode layer is provided in contact with a third portion of the wiring,
And the third portion of the wiring overlaps at least part of the first insulating layer.
The method according to claim 2 or 4,
Wherein the first light emitting layer and the second light emitting layer comprise the same material.
3. The method of claim 2,
And an organic compound layer covering the first insulating layer.
3. The method according to claim 1 or 2,
And the second electrode layer has translucency.
A lighting device comprising the light emitting device according to any one of claims 1 to 3.
A display device comprising the light emitting device according to claim 1 or 2.
Forming a first electrode layer and a wiring on the same insulating surface;
Forming an insulating layer on the first portion of the wiring;
Forming an organic compound layer covering the light emitting layer and the insulating layer on the first electrode layer;
Forming a second electrode layer on the light emitting layer and a conductive layer covering the organic compound layer,
Wherein the second electrode layer is formed in contact with the second portion of the wiring,
Wherein the second portion of the wiring overlaps the insulating layer at least partially.
11. The method of claim 10,
Wherein the insulating layer is formed to have an inverted tapered shape.
11. The method of claim 10,
And the second electrode layer has a light transmitting property.

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